79731428 has 36 divisors (see below), whose sum is σ = 171865260. Its totient is φ = 32159232.

The previous prime is 79731427. The next prime is 79731437. The reversal of 79731428 is 82413797.

It can be written as a sum of positive squares in 2 ways, for example, as 58644964 + 21086464 = 7658^2 + 4592^2 .

It is a super-2 number, since 2×79731428² = 12714201221838368, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (79731427) 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 11 ways as a sum of consecutive naturals, for example, 8633 + ... + 15296.

It is an arithmetic number, because the mean of its divisors is an integer number (4774035).

Almost surely, 2^79731428 is an apocalyptic number.

It is an amenable number.

79731428 is an abundant number, since it is smaller than the sum of its proper divisors (92133832).

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

79731428 is a wasteful number, since it uses less digits than its factorization.

79731428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23964 (or 23955 counting only the distinct ones).

The product of its digits is 84672, while the sum is 41.

The square root of 79731428 is about 8929.2456568290. The cubic root of 79731428 is about 430.4042133817.

The spelling of 79731428 in words is "seventy-nine million, seven hundred thirty-one thousand, four hundred twenty-eight".