64708531 has 4 divisors (see below), whose sum is σ = 65174200. Its totient is φ = 64242864.

The previous prime is 64708529. The next prime is 64708549. The reversal of 64708531 is 13580746.

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

It is a cyclic number.

It is not a de Polignac number, because 64708531 - 2¹ = 64708529 is a prime.

It is a super-2 number, since 2×64708531² = 8374387968355922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64708561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232626 + ... + 232903.

It is an arithmetic number, because the mean of its divisors is an integer number (16293550).

Almost surely, 2^64708531 is an apocalyptic number.

64708531 is a deficient number, since it is larger than the sum of its proper divisors (465669).

64708531 is a wasteful number, since it uses less digits than its factorization.

64708531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465668.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 64708531 is about 8044.1612987309. The cubic root of 64708531 is about 401.4706922834.

The spelling of 64708531 in words is "sixty-four million, seven hundred eight thousand, five hundred thirty-one".