64637695 has 16 divisors (see below), whose sum is σ = 78747552. Its totient is φ = 50928640.

The previous prime is 64637693. The next prime is 64637701. The reversal of 64637695 is 59673646.

It is not a de Polignac number, because 64637695 - 2¹ = 64637693 is a prime.

It is a super-2 number, since 2×64637695² = 8356063229826050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64637693) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131400 + ... + 131890.

It is an arithmetic number, because the mean of its divisors is an integer number (4921722).

Almost surely, 2^64637695 is an apocalyptic number.

64637695 is a deficient number, since it is larger than the sum of its proper divisors (14109857).

64637695 is a wasteful number, since it uses less digits than its factorization.

64637695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842.

The product of its digits is 816480, while the sum is 46.

The square root of 64637695 is about 8039.7571480736. The cubic root of 64637695 is about 401.3241430263.

The spelling of 64637695 in words is "sixty-four million, six hundred thirty-seven thousand, six hundred ninety-five".