79721580 has 48 divisors (see below), whose sum is σ = 230922720. Its totient is φ = 20525568.

The previous prime is 79721573. The next prime is 79721591. The reversal of 79721580 is 8512797.

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 15 ways as a sum of consecutive naturals, for example, 21169 + ... + 24648.

It is an arithmetic number, because the mean of its divisors is an integer number (4810890).

Almost surely, 2^79721580 is an apocalyptic number.

It is an amenable number.

79721580 is an abundant number, since it is smaller than the sum of its proper divisors (151201140).

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

79721580 is a wasteful number, since it uses less digits than its factorization.

79721580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45858 (or 45856 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 39.

The square root of 79721580 is about 8928.6941934417. The cubic root of 79721580 is about 430.3864922425.

The spelling of 79721580 in words is "seventy-nine million, seven hundred twenty-one thousand, five hundred eighty".