172724245 has 16 divisors (see below), whose sum is σ = 213236352. Its totient is φ = 134256960.

The previous prime is 172724213. The next prime is 172724263. The reversal of 172724245 is 542427271.

It is not a de Polignac number, because 172724245 - 2⁵ = 172724213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 172724245.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21904 + ... + 28726.

It is an arithmetic number, because the mean of its divisors is an integer number (13327272).

Almost surely, 2^172724245 is an apocalyptic number.

It is an amenable number.

172724245 is a deficient number, since it is larger than the sum of its proper divisors (40512107).

172724245 is an equidigital number, since it uses as much as digits as its factorization.

172724245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6972.

The product of its digits is 31360, while the sum is 34.

The square root of 172724245 is about 13142.4596251995. The cubic root of 172724245 is about 556.9092537932.

The spelling of 172724245 in words is "one hundred seventy-two million, seven hundred twenty-four thousand, two hundred forty-five".