64136992 has 24 divisors (see below), whose sum is σ = 127394316. Its totient is φ = 31782912.

The previous prime is 64136987. The next prime is 64136993. The reversal of 64136992 is 29963146.

It can be written as a sum of positive squares in 2 ways, for example, as 63297936 + 839056 = 7956^2 + 916^2 .

It is a super-2 number, since 2×64136992² = 8227107485616128, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (64136993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5253 + ... + 12484.

Almost surely, 2^64136992 is an apocalyptic number.

It is an amenable number.

64136992 is a deficient number, since it is larger than the sum of its proper divisors (63257324).

64136992 is a wasteful number, since it uses less digits than its factorization.

64136992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17860 (or 17852 counting only the distinct ones).

The product of its digits is 69984, while the sum is 40.

The square root of 64136992 is about 8008.5574231568. The cubic root of 64136992 is about 400.2851966089.

The spelling of 64136992 in words is "sixty-four million, one hundred thirty-six thousand, nine hundred ninety-two".