79215428 has 6 divisors (see below), whose sum is σ = 138627006. Its totient is φ = 39607712.

The previous prime is 79215407. The next prime is 79215431. The reversal of 79215428 is 82451297.

It can be written as a sum of positive squares in only one way, i.e., 76597504 + 2617924 = 8752^2 + 1618^2 .

It is a junction number, because it is equal to n+sod(n) for n = 79215391 and 79215400.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9901925 + ... + 9901932.

It is an arithmetic number, because the mean of its divisors is an integer number (23104501).

Almost surely, 2^79215428 is an apocalyptic number.

It is an amenable number.

79215428 is a deficient number, since it is larger than the sum of its proper divisors (59411578).

79215428 is a wasteful number, since it uses less digits than its factorization.

79215428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19803861 (or 19803859 counting only the distinct ones).

The product of its digits is 40320, while the sum is 38.

The square root of 79215428 is about 8900.3049385962. The cubic root of 79215428 is about 429.4737170536.

The spelling of 79215428 in words is "seventy-nine million, two hundred fifteen thousand, four hundred twenty-eight".