172155320 has 32 divisors (see below), whose sum is σ = 388307520. Its totient is φ = 68691840.

The previous prime is 172155317. The next prime is 172155337. The reversal of 172155320 is 23551271.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 172155320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11729 + ... + 21951.

It is an arithmetic number, because the mean of its divisors is an integer number (12134610).

Almost surely, 2^172155320 is an apocalyptic number.

172155320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172155320 is an abundant number, since it is smaller than the sum of its proper divisors (216152200).

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

172155320 is a wasteful number, since it uses less digits than its factorization.

172155320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10655 (or 10651 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 172155320 is about 13120.7972318758. The cubic root of 172155320 is about 556.2971256627.

The spelling of 172155320 in words is "one hundred seventy-two million, one hundred fifty-five thousand, three hundred twenty".