79728555 has 32 divisors (see below), whose sum is σ = 136733184. Its totient is φ = 39527936.

The previous prime is 79728547. The next prime is 79728581. The reversal of 79728555 is 55582797.

It is a cyclic number.

It is not a de Polignac number, because 79728555 - 2³ = 79728547 is a prime.

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 in 31 ways as a sum of consecutive naturals, for example, 19282 + ... + 23048.

It is an arithmetic number, because the mean of its divisors is an integer number (4272912).

Almost surely, 2^79728555 is an apocalyptic number.

79728555 is a deficient number, since it is larger than the sum of its proper divisors (57004629).

79728555 is a wasteful number, since it uses less digits than its factorization.

79728555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3875.

The product of its digits is 882000, while the sum is 48.

The square root of 79728555 is about 8929.0847795281. The cubic root of 79728555 is about 430.3990436672.

The spelling of 79728555 in words is "seventy-nine million, seven hundred twenty-eight thousand, five hundred fifty-five".