78734633880 has 128 divisors (see below), whose sum is σ = 274522867200. Its totient is φ = 17691451392.

The previous prime is 78734633839. The next prime is 78734633893. The reversal of 78734633880 is 8833643787.

It is a self number, because there is not a number n which added to its sum of digits gives 78734633880.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 744777 + ... + 843896.

It is an arithmetic number, because the mean of its divisors is an integer number (2144709900).

Almost surely, 2^78734633880 is an apocalyptic number.

78734633880 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

78734633880 is an abundant number, since it is smaller than the sum of its proper divisors (195788233320).

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

78734633880 is a wasteful number, since it uses less digits than its factorization.

78734633880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1588753 (or 1588749 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 57.

The spelling of 78734633880 in words is "seventy-eight billion, seven hundred thirty-four million, six hundred thirty-three thousand, eight hundred eighty".