79721904 has 20 divisors (see below), whose sum is σ = 205948376. Its totient is φ = 26573952.

The previous prime is 79721903. The next prime is 79721923. The reversal of 79721904 is 40912797.

It is not an unprimeable number, because it can be changed into a prime (79721903) 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 3 ways as a sum of consecutive naturals, for example, 830389 + ... + 830484.

Almost surely, 2^79721904 is an apocalyptic number.

It is an amenable number.

79721904 is an abundant number, since it is smaller than the sum of its proper divisors (126226472).

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

79721904 is a wasteful number, since it uses less digits than its factorization.

79721904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1660884 (or 1660878 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 39.

The square root of 79721904 is about 8928.7123371738. The cubic root of 79721904 is about 430.3870752926.

The spelling of 79721904 in words is "seventy-nine million, seven hundred twenty-one thousand, nine hundred four".