78904887656 has 192 divisors, whose sum is σ = 182751252480. Its totient is φ = 31274449920.

The previous prime is 78904887653. The next prime is 78904887661. The reversal of 78904887656 is 65678840987.

It is not an unprimeable number, because it can be changed into a prime (78904887653) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 187422326 + ... + 187422746.

It is an arithmetic number, because the mean of its divisors is an integer number (951829440).

Almost surely, 2^78904887656 is an apocalyptic number.

78904887656 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78904887656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91375626240).

78904887656 is an abundant number, since it is smaller than the sum of its proper divisors (103846364824).

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

78904887656 is a wasteful number, since it uses less digits than its factorization.

78904887656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672 (or 649 counting only the distinct ones).

The product of its (nonzero) digits is 162570240, while the sum is 68.

The spelling of 78904887656 in words is "seventy-eight billion, nine hundred four million, eight hundred eighty-seven thousand, six hundred fifty-six".