64185138 has 12 divisors (see below), whose sum is σ = 139067838. Its totient is φ = 21395040.

The previous prime is 64185137. The next prime is 64185151. The reversal of 64185138 is 83158146.

64185138 is a `hidden beast` number, since 641 + 8 + 5 + 1 + 3 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 42029289 + 22155849 = 6483^2 + 4707^2 .

It is not an unprimeable number, because it can be changed into a prime (64185137) 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, 1782903 + ... + 1782938.

Almost surely, 2^64185138 is an apocalyptic number.

64185138 is an abundant number, since it is smaller than the sum of its proper divisors (74882700).

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

64185138 is a wasteful number, since it uses less digits than its factorization.

64185138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3565849 (or 3565846 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 64185138 is about 8011.5627688985. The cubic root of 64185138 is about 400.3853328440.

The spelling of 64185138 in words is "sixty-four million, one hundred eighty-five thousand, one hundred thirty-eight".