7904491656 has 32 divisors (see below), whose sum is σ = 20134085760. Its totient is φ = 2585116352.

The previous prime is 7904491579. The next prime is 7904491687. The reversal of 7904491656 is 6561944097.

It is a junction number, because it is equal to n+sod(n) for n = 7904491599 and 7904491608.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3105840 + ... + 3108383.

It is an arithmetic number, because the mean of its divisors is an integer number (629190180).

Almost surely, 2^7904491656 is an apocalyptic number.

It is an amenable number.

7904491656 is an abundant number, since it is smaller than the sum of its proper divisors (12229594104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7904491656 is a wasteful number, since it uses less digits than its factorization.

7904491656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6214285 (or 6214281 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 51.

The square root of 7904491656 is about 88907.2081217266. The cubic root of 7904491656 is about 1992.0090865055.

The spelling of 7904491656 in words is "seven billion, nine hundred four million, four hundred ninety-one thousand, six hundred fifty-six".