172922720 has 24 divisors (see below), whose sum is σ = 408530304. Its totient is φ = 69169024.

The previous prime is 172922689. The next prime is 172922749. The reversal of 172922720 is 27229271.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 540224 + ... + 540543.

It is an arithmetic number, because the mean of its divisors is an integer number (17022096).

Almost surely, 2^172922720 is an apocalyptic number.

172922720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172922720 is an abundant number, since it is smaller than the sum of its proper divisors (235607584).

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

172922720 is a wasteful number, since it uses less digits than its factorization.

172922720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080782 (or 1080774 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 172922720 is about 13150.0083650164. The cubic root of 172922720 is about 557.1224843369.

The spelling of 172922720 in words is "one hundred seventy-two million, nine hundred twenty-two thousand, seven hundred twenty".