78920686400 has 84 divisors (see below), whose sum is σ = 198710531712. Its totient is φ = 30834101760.

The previous prime is 78920686387. The next prime is 78920686409. The reversal of 78920686400 is 468602987.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78920686409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 504752 + ... + 642351.

It is an arithmetic number, because the mean of its divisors is an integer number (2365601568).

Almost surely, 2^78920686400 is an apocalyptic number.

It is an amenable number.

78920686400 is an abundant number, since it is smaller than the sum of its proper divisors (119789845312).

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

78920686400 is a wasteful number, since it uses less digits than its factorization.

78920686400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1147168 (or 1147153 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 50.

The spelling of 78920686400 in words is "seventy-eight billion, nine hundred twenty million, six hundred eighty-six thousand, four hundred".