79721375 has 8 divisors (see below), whose sum is σ = 99492432. Its totient is φ = 63777000.

The previous prime is 79721371. The next prime is 79721419. The reversal of 79721375 is 57312797.

It is not a de Polignac number, because 79721375 - 2² = 79721371 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79721371) 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, 318761 + ... + 319010.

It is an arithmetic number, because the mean of its divisors is an integer number (12436554).

Almost surely, 2^79721375 is an apocalyptic number.

79721375 is a deficient number, since it is larger than the sum of its proper divisors (19771057).

79721375 is an equidigital number, since it uses as much as digits as its factorization.

79721375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637786 (or 637776 counting only the distinct ones).

The product of its digits is 92610, while the sum is 41.

The square root of 79721375 is about 8928.6827135922. The cubic root of 79721375 is about 430.3861233365.

The spelling of 79721375 in words is "seventy-nine million, seven hundred twenty-one thousand, three hundred seventy-five".