79721420 has 24 divisors (see below), whose sum is σ = 168984144. Its totient is φ = 31589696.

The previous prime is 79721419. The next prime is 79721423. The reversal of 79721420 is 2412797.

It is not an unprimeable number, because it can be changed into a prime (79721423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16487 + ... + 20766.

It is an arithmetic number, because the mean of its divisors is an integer number (7041006).

Almost surely, 2^79721420 is an apocalyptic number.

It is an amenable number.

79721420 is an abundant number, since it is smaller than the sum of its proper divisors (89262724).

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

79721420 is a wasteful number, since it uses less digits than its factorization.

79721420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37369 (or 37367 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 79721420 is about 8928.6852335604. The cubic root of 79721420 is about 430.3862043159.

The spelling of 79721420 in words is "seventy-nine million, seven hundred twenty-one thousand, four hundred twenty".