64131908 has 24 divisors (see below), whose sum is σ = 114934680. Its totient is φ = 31299840.

The previous prime is 64131883. The next prime is 64131911. The reversal of 64131908 is 80913146.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 46676224 + 17455684 = 6832^2 + 4178^2 .

It is a super-2 number, since 2×64131908² = 8225803247440928, which contains 22 as substring.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47888 + ... + 49208.

It is an arithmetic number, because the mean of its divisors is an integer number (4788945).

Almost surely, 2^64131908 is an apocalyptic number.

It is an amenable number.

64131908 is a deficient number, since it is larger than the sum of its proper divisors (50802772).

64131908 is a wasteful number, since it uses less digits than its factorization.

64131908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1607 (or 1605 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 64131908 is about 8008.2400063934. The cubic root of 64131908 is about 400.2746197502.

It can be divided in two parts, 6413 and 1908, that multiplied together give a square (12236004 = 3498²).

The spelling of 64131908 in words is "sixty-four million, one hundred thirty-one thousand, nine hundred eight".