78501520872 has 32 divisors (see below), whose sum is σ = 218059780800. Its totient is φ = 26167173552.

The previous prime is 78501520861. The next prime is 78501520873. The reversal of 78501520872 is 27802510587.

78501520872 is a `hidden beast` number, since 7 + 8 + 50 + 1 + 520 + 8 + 72 = 666.

It is not an unprimeable number, because it can be changed into a prime (78501520873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181716268 + ... + 181716699.

It is an arithmetic number, because the mean of its divisors is an integer number (6814368150).

Almost surely, 2^78501520872 is an apocalyptic number.

78501520872 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

78501520872 is an abundant number, since it is smaller than the sum of its proper divisors (139558259928).

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

78501520872 is a wasteful number, since it uses less digits than its factorization.

78501520872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363432982 (or 363432972 counting only the distinct ones).

The product of its (nonzero) digits is 313600, while the sum is 45.

The spelling of 78501520872 in words is "seventy-eight billion, five hundred one million, five hundred twenty thousand, eight hundred seventy-two".