78720477874 has 32 divisors (see below), whose sum is σ = 129022156800. Its totient is φ = 35884095120.

The previous prime is 78720477853. The next prime is 78720477877. The reversal of 78720477874 is 47877402787.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (78720477877) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24199 + ... + 397525.

It is an arithmetic number, because the mean of its divisors is an integer number (4031942400).

Almost surely, 2^78720477874 is an apocalyptic number.

78720477874 is a deficient number, since it is larger than the sum of its proper divisors (50301678926).

78720477874 is a wasteful number, since it uses less digits than its factorization.

78720477874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373558.

The product of its (nonzero) digits is 34420736, while the sum is 61.

The spelling of 78720477874 in words is "seventy-eight billion, seven hundred twenty million, four hundred seventy-seven thousand, eight hundred seventy-four".