64764531 has 12 divisors (see below), whose sum is σ = 100745008. Its totient is φ = 39855024.

The previous prime is 64764529. The next prime is 64764563. The reversal of 64764531 is 13546746.

It is a happy number.

64764531 is a `hidden beast` number, since 6 + 4 + 7 + 645 + 3 + 1 = 666.

It is not a de Polignac number, because 64764531 - 2¹ = 64764529 is a prime.

It is a super-2 number, since 2×64764531² = 8388888951299922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64765531) 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, 276655 + ... + 276888.

Almost surely, 2^64764531 is an apocalyptic number.

64764531 is a deficient number, since it is larger than the sum of its proper divisors (35980477).

64764531 is a wasteful number, since it uses less digits than its factorization.

64764531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553562 (or 553559 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 64764531 is about 8047.6413314710. The cubic root of 64764531 is about 401.5864723616.

The spelling of 64764531 in words is "sixty-four million, seven hundred sixty-four thousand, five hundred thirty-one".