79128656 has 10 divisors (see below), whose sum is σ = 153311802. Its totient is φ = 39564320.

The previous prime is 79128653. The next prime is 79128661. The reversal of 79128656 is 65682197.

It can be written as a sum of positive squares in only one way, i.e., 70224400 + 8904256 = 8380^2 + 2984^2 .

It is a super-2 number, since 2×79128656² = 12522688400732672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79128653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2472755 + ... + 2472786.

Almost surely, 2^79128656 is an apocalyptic number.

It is an amenable number.

79128656 is a deficient number, since it is larger than the sum of its proper divisors (74183146).

79128656 is a wasteful number, since it uses less digits than its factorization.

79128656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4945549 (or 4945543 counting only the distinct ones).

The product of its digits is 181440, while the sum is 44.

The square root of 79128656 is about 8895.4289385054. The cubic root of 79128656 is about 429.3168456391.

The spelling of 79128656 in words is "seventy-nine million, one hundred twenty-eight thousand, six hundred fifty-six".