172705872 has 20 divisors (see below), whose sum is σ = 446156960. Its totient is φ = 57568608.

The previous prime is 172705831. The next prime is 172705901. The reversal of 172705872 is 278507271.

It is a self number, because there is not a number n which added to its sum of digits gives 172705872.

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, 1798972 + ... + 1799067.

It is an arithmetic number, because the mean of its divisors is an integer number (22307848).

Almost surely, 2^172705872 is an apocalyptic number.

172705872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

172705872 is an abundant number, since it is smaller than the sum of its proper divisors (273451088).

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

172705872 is a wasteful number, since it uses less digits than its factorization.

172705872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3598050 (or 3598044 counting only the distinct ones).

The product of its (nonzero) digits is 54880, while the sum is 39.

The square root of 172705872 is about 13141.7606126424. The cubic root of 172705872 is about 556.8895066011.

The spelling of 172705872 in words is "one hundred seventy-two million, seven hundred five thousand, eight hundred seventy-two".