79721936 has 40 divisors (see below), whose sum is σ = 176994624. Its totient is φ = 34076160.

The previous prime is 79721927. The next prime is 79721947. The reversal of 79721936 is 63912797.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 57896 + ... + 59256.

Almost surely, 2^79721936 is an apocalyptic number.

It is an amenable number.

79721936 is an abundant number, since it is smaller than the sum of its proper divisors (97272688).

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

79721936 is a wasteful number, since it uses less digits than its factorization.

79721936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1899 (or 1893 counting only the distinct ones).

The product of its digits is 142884, while the sum is 44.

The square root of 79721936 is about 8928.7141291454. The cubic root of 79721936 is about 430.3871328777.

The spelling of 79721936 in words is "seventy-nine million, seven hundred twenty-one thousand, nine hundred thirty-six".