64139139 has 12 divisors (see below), whose sum is σ = 93466776. Its totient is φ = 42380352.

The previous prime is 64139087. The next prime is 64139149. The reversal of 64139139 is 93193146.

64139139 is a `hidden beast` number, since 641 + 3 + 9 + 1 + 3 + 9 = 666.

It is not a de Polignac number, because 64139139 - 2¹¹ = 64137091 is a prime.

It is a super-2 number, since 2×64139139² = 8227658303322642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64139149) 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, 30517 + ... + 32550.

It is an arithmetic number, because the mean of its divisors is an integer number (7788898).

Almost surely, 2^64139139 is an apocalyptic number.

64139139 is a deficient number, since it is larger than the sum of its proper divisors (29327637).

64139139 is a wasteful number, since it uses less digits than its factorization.

64139139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63186 (or 63183 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 64139139 is about 8008.6914661510. The cubic root of 64139139 is about 400.2896631042.

The spelling of 64139139 in words is "sixty-four million, one hundred thirty-nine thousand, one hundred thirty-nine".