78656497920 has 1728 divisors, whose sum is σ = 385697894400. Its totient is φ = 14253096960.

The previous prime is 78656497919. The next prime is 78656497943. The reversal of 78656497920 is 2979465687.

78656497920 is a `hidden beast` number, since 7 + 8 + 6 + 56 + 497 + 92 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 219098701 + ... + 219099059.

It is an arithmetic number, because the mean of its divisors is an integer number (223204800).

Almost surely, 2^78656497920 is an apocalyptic number.

78656497920 is a gapful number since it is divisible by the number (70) 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 78656497920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192848947200).

78656497920 is an abundant number, since it is smaller than the sum of its proper divisors (307041396480).

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

78656497920 is a wasteful number, since it uses less digits than its factorization.

78656497920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436 (or 419 counting only the distinct ones).

The product of its (nonzero) digits is 45722880, while the sum is 63.

The spelling of 78656497920 in words is "seventy-eight billion, six hundred fifty-six million, four hundred ninety-seven thousand, nine hundred twenty".