791687640 has 32 divisors (see below), whose sum is σ = 2375063280. Its totient is φ = 211116672.

The previous prime is 791687639. The next prime is 791687653. The reversal of 791687640 is 46786197.

It is a self number, because there is not a number n which added to its sum of digits gives 791687640.

It is a congruent number.

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, 3298579 + ... + 3298818.

Almost surely, 2^791687640 is an apocalyptic number.

It is an amenable number.

791687640 is an abundant number, since it is smaller than the sum of its proper divisors (1583375640).

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

791687640 is a wasteful number, since it uses less digits than its factorization.

791687640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6597411 (or 6597407 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 48.

The square root of 791687640 is about 28136.9443970023. The cubic root of 791687640 is about 925.0913530424.

The spelling of 791687640 in words is "seven hundred ninety-one million, six hundred eighty-seven thousand, six hundred forty".