172135872 has 42 divisors (see below), whose sum is σ = 493398048. Its totient is φ = 57378432.

The previous prime is 172135871. The next prime is 172135883. The reversal of 172135872 is 278531271.

172135872 is a `hidden beast` number, since 1 + 72 + 1 + 3 + 587 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172135871) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 148848 + ... + 149999.

Almost surely, 2^172135872 is an apocalyptic number.

172135872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

172135872 is an abundant number, since it is smaller than the sum of its proper divisors (321262176).

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

172135872 is a wasteful number, since it uses less digits than its factorization.

172135872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298865 (or 298852 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 172135872 is about 13120.0560974410. The cubic root of 172135872 is about 556.2761769948.

The spelling of 172135872 in words is "one hundred seventy-two million, one hundred thirty-five thousand, eight hundred seventy-two".