79957761840 has 240 divisors, whose sum is σ = 302386646016. Its totient is φ = 18758361600.

The previous prime is 79957761827. The next prime is 79957761859. The reversal of 79957761840 is 4816775997.

79957761840 is a `hidden beast` number, since 7 + 9 + 9 + 5 + 7 + 7 + 618 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 82687 + ... + 408353.

Almost surely, 2^79957761840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79957761840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151193323008).

79957761840 is an abundant number, since it is smaller than the sum of its proper divisors (222428884176).

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

79957761840 is a wasteful number, since it uses less digits than its factorization.

79957761840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325728 (or 325719 counting only the distinct ones).

The product of its (nonzero) digits is 26671680, while the sum is 63.

The spelling of 79957761840 in words is "seventy-nine billion, nine hundred fifty-seven million, seven hundred sixty-one thousand, eight hundred forty".