172224639 has 12 divisors (see below), whose sum is σ = 252482776. Its totient is φ = 113102352.

The previous prime is 172224631. The next prime is 172224653. The reversal of 172224639 is 936422271.

172224639 is a `hidden beast` number, since 17 + 2 + 2 + 2 + 4 + 639 = 666.

It is not a de Polignac number, because 172224639 - 2³ = 172224631 is a prime.

It is a super-2 number, since 2×172224639² = 59322652557360642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172224631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 142204 + ... + 143409.

Almost surely, 2^172224639 is an apocalyptic number.

172224639 is a deficient number, since it is larger than the sum of its proper divisors (80258137).

172224639 is a wasteful number, since it uses less digits than its factorization.

172224639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285686 (or 285683 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 172224639 is about 13123.4385356887. The cubic root of 172224639 is about 556.3717807008.

The spelling of 172224639 in words is "one hundred seventy-two million, two hundred twenty-four thousand, six hundred thirty-nine".