64136868 has 12 divisors (see below), whose sum is σ = 149652720. Its totient is φ = 21378952.

The previous prime is 64136867. The next prime is 64136881. The reversal of 64136868 is 86863146.

It is a happy number.

64136868 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×64136868² = 8227075673698848, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) 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 (64136867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2672358 + ... + 2672381.

It is an arithmetic number, because the mean of its divisors is an integer number (12471060).

Almost surely, 2^64136868 is an apocalyptic number.

It is an amenable number.

64136868 is an abundant number, since it is smaller than the sum of its proper divisors (85515852).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64136868 is a wasteful number, since it uses less digits than its factorization.

64136868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5344746 (or 5344744 counting only the distinct ones).

The product of its digits is 165888, while the sum is 42.

The square root of 64136868 is about 8008.5496814342. The cubic root of 64136868 is about 400.2849386434.

The spelling of 64136868 in words is "sixty-four million, one hundred thirty-six thousand, eight hundred sixty-eight".