| Base | Representation |
|---|---|
| bin | 1001001000100111100111110… |
| … | …0111100101011110010010000 |
| 3 | 10010021221122112000201021101100 |
| 4 | 2102021321330330223302100 |
| 5 | 1133223030131341033340 |
| 6 | 10155040101114304400 |
| 7 | 252252304341116250 |
| oct | 22211717474536220 |
| 9 | 3107848460637340 |
| 10 | 642795491736720 |
| 11 | 1768a6045494673 |
| 12 | 601160a5728100 |
| 13 | 2178947c5a73ba |
| 14 | b4a3679901960 |
| 15 | 4e4a8bc4d7830 |
| hex | 2489e7cf2bc90 |
642795491736720 has 480 divisors, whose sum is σ = 2546824396806144. Its totient is φ = 142177926758400.
The previous prime is 642795491736653. The next prime is 642795491736721. The reversal of 642795491736720 is 27637194597246.
642795491736720 is a `hidden beast` number, since 6 + 4 + 2 + 7 + 9 + 5 + 491 + 73 + 67 + 2 + 0 = 666.
642795491736720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a hoax number, since the sum of its digits (72) coincides with the sum of the digits of its distinct prime factors.
It is a Harshad number since it is a multiple of its sum of digits (72).
It is not an unprimeable number, because it can be changed into a prime (642795491736721) by changing a digit.
It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3420468360 + ... + 3420656280.
Almost surely, 2642795491736720 is an apocalyptic number.
642795491736720 is a gapful number since it is divisible by the number (60) 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 642795491736720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1273412198403072).
642795491736720 is an abundant number, since it is smaller than the sum of its proper divisors (1904028905069424).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
642795491736720 is a wasteful number, since it uses less digits than its factorization.
642795491736720 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 209871 (or 209862 counting only the distinct ones).
The product of its (nonzero) digits is 960180480, while the sum is 72.
The spelling of 642795491736720 in words is "six hundred forty-two trillion, seven hundred ninety-five billion, four hundred ninety-one million, seven hundred thirty-six thousand, seven hundred twenty".
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