64538172 has 36 divisors (see below), whose sum is σ = 164979360. Its totient is φ = 21269952.

The previous prime is 64538167. The next prime is 64538179. The reversal of 64538172 is 27183546.

64538172 is a `hidden beast` number, since 645 + 3 + 8 + 1 + 7 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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 (64538179) 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, 6868 + ... + 13275.

It is an arithmetic number, because the mean of its divisors is an integer number (4582760).

Almost surely, 2^64538172 is an apocalyptic number.

It is an amenable number.

64538172 is an abundant number, since it is smaller than the sum of its proper divisors (100441188).

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

64538172 is a wasteful number, since it uses less digits than its factorization.

64538172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20242 (or 20237 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 64538172 is about 8033.5653355157. The cubic root of 64538172 is about 401.1180635894.

The spelling of 64538172 in words is "sixty-four million, five hundred thirty-eight thousand, one hundred seventy-two".