64140008 has 16 divisors (see below), whose sum is σ = 125491680. Its totient is φ = 30675568.

The previous prime is 64139987. The next prime is 64140019. The reversal of 64140008 is 80004146.

It is a happy number.

It is a super-2 number, since 2×64140008² = 8227881252480128, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174110 + ... + 174477.

It is an arithmetic number, because the mean of its divisors is an integer number (7843230).

Almost surely, 2^64140008 is an apocalyptic number.

It is an amenable number.

64140008 is a deficient number, since it is larger than the sum of its proper divisors (61351672).

64140008 is a wasteful number, since it uses less digits than its factorization.

64140008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348616 (or 348612 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 64140008 is about 8008.7457195244. The cubic root of 64140008 is about 400.2914708935.

The spelling of 64140008 in words is "sixty-four million, one hundred forty thousand, eight".