172904790 has 64 divisors (see below), whose sum is σ = 450152640. Its totient is φ = 42332160.

The previous prime is 172904783. The next prime is 172904813. The reversal of 172904790 is 97409271.

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 31 ways as a sum of consecutive naturals, for example, 16776 + ... + 25044.

It is an arithmetic number, because the mean of its divisors is an integer number (7033635).

Almost surely, 2^172904790 is an apocalyptic number.

172904790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 172904790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (225076320).

172904790 is an abundant number, since it is smaller than the sum of its proper divisors (277247850).

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

172904790 is a wasteful number, since it uses less digits than its factorization.

172904790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8337.

The product of its (nonzero) digits is 31752, while the sum is 39.

The square root of 172904790 is about 13149.3265987274. The cubic root of 172904790 is about 557.1032280444.

The spelling of 172904790 in words is "one hundred seventy-two million, nine hundred four thousand, seven hundred ninety".