64136544 has 24 divisors (see below), whose sum is σ = 168358680. Its totient is φ = 21378816.

The previous prime is 64136543. The next prime is 64136557. The reversal of 64136544 is 44563146.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×64136544² = 8226992552527872, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64136543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333949 + ... + 334140.

It is an arithmetic number, because the mean of its divisors is an integer number (7014945).

Almost surely, 2^64136544 is an apocalyptic number.

It is an amenable number.

64136544 is an abundant number, since it is smaller than the sum of its proper divisors (104222136).

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

64136544 is a wasteful number, since it uses less digits than its factorization.

64136544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668102 (or 668094 counting only the distinct ones).

The product of its digits is 34560, while the sum is 33.

The square root of 64136544 is about 8008.5294530269. The cubic root of 64136544 is about 400.2842646029.

The spelling of 64136544 in words is "sixty-four million, one hundred thirty-six thousand, five hundred forty-four".