64432138 has 4 divisors (see below), whose sum is σ = 96648210. Its totient is φ = 32216068.

The previous prime is 64432117. The next prime is 64432157. The reversal of 64432138 is 83123446.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 39601849 + 24830289 = 6293^2 + 4983^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16108033 + ... + 16108036.

Almost surely, 2^64432138 is an apocalyptic number.

64432138 is a deficient number, since it is larger than the sum of its proper divisors (32216072).

64432138 is a wasteful number, since it uses less digits than its factorization.

64432138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32216071.

The product of its digits is 13824, while the sum is 31.

The square root of 64432138 is about 8026.9631866603. The cubic root of 64432138 is about 400.8982687730.

The spelling of 64432138 in words is "sixty-four million, four hundred thirty-two thousand, one hundred thirty-eight".