78140955864 has 64 divisors (see below), whose sum is σ = 195758726400. Its totient is φ = 25992880256.

The previous prime is 78140955857. The next prime is 78140955901. The reversal of 78140955864 is 46855904187.

It is a super-2 number, since 2×78140955864² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38322157 + ... + 38324195.

It is an arithmetic number, because the mean of its divisors is an integer number (3058730100).

Almost surely, 2^78140955864 is an apocalyptic number.

It is an amenable number.

78140955864 is an abundant number, since it is smaller than the sum of its proper divisors (117617770536).

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

78140955864 is a wasteful number, since it uses less digits than its factorization.

78140955864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4584 (or 4580 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 57.

The spelling of 78140955864 in words is "seventy-eight billion, one hundred forty million, nine hundred fifty-five thousand, eight hundred sixty-four".