78915861400 has 48 divisors (see below), whose sum is σ = 189806266800. Its totient is φ = 30477847680.

The previous prime is 78915861397. The next prime is 78915861473. The reversal of 78915861400 is 416851987.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6797292 + ... + 6808891.

It is an arithmetic number, because the mean of its divisors is an integer number (3954297225).

Almost surely, 2^78915861400 is an apocalyptic number.

It is an amenable number.

78915861400 is an abundant number, since it is smaller than the sum of its proper divisors (110890405400).

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

78915861400 is a wasteful number, since it uses less digits than its factorization.

78915861400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13606228 (or 13606219 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 49.

The spelling of 78915861400 in words is "seventy-eight billion, nine hundred fifteen million, eight hundred sixty-one thousand, four hundred".