64437138 has 12 divisors (see below), whose sum is σ = 139613838. Its totient is φ = 21479040.

The previous prime is 64437083. The next prime is 64437161. The reversal of 64437138 is 83173446.

64437138 is a `hidden beast` number, since 644 + 3 + 7 + 1 + 3 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 63632529 + 804609 = 7977^2 + 897^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1789903 + ... + 1789938.

Almost surely, 2^64437138 is an apocalyptic number.

64437138 is an abundant number, since it is smaller than the sum of its proper divisors (75176700).

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

64437138 is a wasteful number, since it uses less digits than its factorization.

64437138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3579849 (or 3579846 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 64437138 is about 8027.2746309068. The cubic root of 64437138 is about 400.9086385438.

The spelling of 64437138 in words is "sixty-four million, four hundred thirty-seven thousand, one hundred thirty-eight".