64139565 has 32 divisors (see below), whose sum is σ = 118204416. Its totient is φ = 29090880.

The previous prime is 64139563. The next prime is 64139587. The reversal of 64139565 is 56593146.

It is not a de Polignac number, because 64139565 - 2¹ = 64139563 is a prime.

It is a super-2 number, since 2×64139565² = 8227767596778450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64139563) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11424 + ... + 16086.

It is an arithmetic number, because the mean of its divisors is an integer number (3693888).

Almost surely, 2^64139565 is an apocalyptic number.

It is an amenable number.

64139565 is a deficient number, since it is larger than the sum of its proper divisors (54064851).

64139565 is a wasteful number, since it uses less digits than its factorization.

64139565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4809.

The product of its digits is 97200, while the sum is 39.

The square root of 64139565 is about 8008.7180622120. The cubic root of 64139565 is about 400.2905493183.

The spelling of 64139565 in words is "sixty-four million, one hundred thirty-nine thousand, five hundred sixty-five".