78749454720 has 64 divisors (see below), whose sum is σ = 251013893040. Its totient is φ = 20999854080.

The previous prime is 78749454709. The next prime is 78749454761. The reversal of 78749454720 is 2745494787.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20505751 + ... + 20509590.

Almost surely, 2^78749454720 is an apocalyptic number.

It is an amenable number.

78749454720 is an abundant number, since it is smaller than the sum of its proper divisors (172264438320).

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

78749454720 is a wasteful number, since it uses less digits than its factorization.

78749454720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41015363 (or 41015351 counting only the distinct ones).

The product of its (nonzero) digits is 15805440, while the sum is 57.

The spelling of 78749454720 in words is "seventy-eight billion, seven hundred forty-nine million, four hundred fifty-four thousand, seven hundred twenty".