78913652500 has 30 divisors (see below), whose sum is σ = 172568380754. Its totient is φ = 31565460000.

The previous prime is 78913652459. The next prime is 78913652509. The reversal of 78913652500 is 525631987.

It can be written as a sum of positive squares in 5 ways, for example, as 52362253584 + 26551398916 = 228828^2 + 162946^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78913652509) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 15780231 + ... + 15785230.

Almost surely, 2^78913652500 is an apocalyptic number.

It is an amenable number.

78913652500 is an abundant number, since it is smaller than the sum of its proper divisors (93654728254).

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

78913652500 is a wasteful number, since it uses less digits than its factorization.

78913652500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31565485 (or 31565468 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 46.

The spelling of 78913652500 in words is "seventy-eight billion, nine hundred thirteen million, six hundred fifty-two thousand, five hundred".