| Base | Representation |
|---|---|
| bin | 10010011101110101100010… |
| … | …101101011100000000000000 |
| 3 | 101122120002121102021011101000 |
| 4 | 102131311202231130000000 |
| 5 | 41121112203311202100 |
| 6 | 444421424445012000 |
| 7 | 23051414120344404 |
| oct | 2235654255340000 |
| 9 | 348502542234330 |
| 10 | 81215192678400 |
| 11 | 23972195a9a3a0 |
| 12 | 913806b854000 |
| 13 | 3641737b88851 |
| 14 | 160ab9cb3b104 |
| 15 | 95c8d82e8900 |
| hex | 49dd62b5c000 |
81215192678400 has 2880 divisors, whose sum is σ = 348173900444160. Its totient is φ = 18342110822400.
The previous prime is 81215192678377. The next prime is 81215192678423. The reversal of 81215192678400 is 487629151218.
81215192678400 is a `hidden beast` number, since 8 + 1 + 21 + 519 + 2 + 67 + 8 + 40 + 0 = 666.
It is an interprime number because it is at equal distance from previous prime (81215192678377) and next prime (81215192678423).
It is a tau number, because it is divible by the number of its divisors (2880).
It is a Harshad number since it is a multiple of its sum of digits (54).
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 357776179087 + ... + 357776179313.
It is an arithmetic number, because the mean of its divisors is an integer number (120893715432).
Almost surely, 281215192678400 is an apocalyptic number.
81215192678400 is a gapful number since it is divisible by the number (80) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 81215192678400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174086950222080).
81215192678400 is an abundant number, since it is smaller than the sum of its proper divisors (266958707765760).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
81215192678400 is a wasteful number, since it uses less digits than its factorization.
81215192678400 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 475 (or 438 counting only the distinct ones).
The product of its (nonzero) digits is 1935360, while the sum is 54.
The spelling of 81215192678400 in words is "eighty-one trillion, two hundred fifteen billion, one hundred ninety-two million, six hundred seventy-eight thousand, four hundred".
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