172457920 has 28 divisors (see below), whose sum is σ = 410666184. Its totient is φ = 68983040.

The previous prime is 172457903. The next prime is 172457921. The reversal of 172457920 is 29754271.

It is a self number, because there is not a number n which added to its sum of digits gives 172457920.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172457921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269146 + ... + 269785.

Almost surely, 2^172457920 is an apocalyptic number.

172457920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172457920 is an abundant number, since it is smaller than the sum of its proper divisors (238208264).

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

172457920 is an equidigital number, since it uses as much as digits as its factorization.

172457920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538948 (or 538938 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 172457920 is about 13132.3234806336. The cubic root of 172457920 is about 556.6228721607.

The spelling of 172457920 in words is "one hundred seventy-two million, four hundred fifty-seven thousand, nine hundred twenty".