791215656 has 64 divisors (see below), whose sum is σ = 2466132480. Its totient is φ = 205510080.

The previous prime is 791215639. The next prime is 791215657. The reversal of 791215656 is 656512197.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (791215657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212226 + ... + 215921.

It is an arithmetic number, because the mean of its divisors is an integer number (38533320).

Almost surely, 2^791215656 is an apocalyptic number.

It is an amenable number.

791215656 is an abundant number, since it is smaller than the sum of its proper divisors (1674916824).

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

791215656 is a wasteful number, since it uses less digits than its factorization.

791215656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428174 (or 428170 counting only the distinct ones).

The product of its digits is 113400, while the sum is 42.

The square root of 791215656 is about 28128.5558818792. Note that the first 3 decimals coincide. The cubic root of 791215656 is about 924.9074778654.

The spelling of 791215656 in words is "seven hundred ninety-one million, two hundred fifteen thousand, six hundred fifty-six".