172716728 has 16 divisors (see below), whose sum is σ = 330734880. Its totient is φ = 84520768.

The previous prime is 172716697. The next prime is 172716737. The reversal of 172716728 is 827617271.

172716728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229301 + ... + 230052.

It is an arithmetic number, because the mean of its divisors is an integer number (20670930).

Almost surely, 2^172716728 is an apocalyptic number.

It is an amenable number.

172716728 is a deficient number, since it is larger than the sum of its proper divisors (158018152).

172716728 is a wasteful number, since it uses less digits than its factorization.

172716728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459406 (or 459402 counting only the distinct ones).

The product of its digits is 65856, while the sum is 41.

The square root of 172716728 is about 13142.1736406121. The cubic root of 172716728 is about 556.9011747352.

The spelling of 172716728 in words is "one hundred seventy-two million, seven hundred sixteen thousand, seven hundred twenty-eight".