| Base | Representation |
|---|---|
| bin | 1001101010100… |
| … | …00100000000000 |
| 3 | 12122112210020120 |
| 4 | 10311100200000 |
| 5 | 131223220310 |
| 6 | 12013340240 |
| 7 | 2003040630 |
| oct | 465204000 |
| 9 | 178483216 |
| 10 | 81070080 |
| 11 | 41842173 |
| 12 | 23197680 |
| 13 | 13a46480 |
| 14 | aaa46c0 |
| 15 | 71b5b70 |
| hex | 4d50800 |
81070080 has 384 divisors, whose sum is σ = 330220800. Its totient is φ = 16515072.
The previous prime is 81070063. The next prime is 81070097. The reversal of 81070080 is 8007018.
It is an interprime number because it is at equal distance from previous prime (81070063) and next prime (81070097).
It is a tau number, because it is divible by the number of its divisors (384).
It is a Harshad number since it is a multiple of its sum of digits (24).
It is a self number, because there is not a number n which added to its sum of digits gives 81070080.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2795506 + ... + 2795534.
It is an arithmetic number, because the mean of its divisors is an integer number (859950).
Almost surely, 281070080 is an apocalyptic number.
81070080 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 81070080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165110400).
81070080 is an abundant number, since it is smaller than the sum of its proper divisors (249150720).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
81070080 is a wasteful number, since it uses less digits than its factorization.
81070080 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 79 (or 59 counting only the distinct ones).
The product of its (nonzero) digits is 448, while the sum is 24.
The square root of 81070080 is about 9003.8924915838. The cubic root of 81070080 is about 432.7996164194.
Adding to 81070080 its reverse (8007018), we get a palindrome (89077098).
The spelling of 81070080 in words is "eighty-one million, seventy thousand, eighty".
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