64400636 has 12 divisors (see below), whose sum is σ = 113065680. Its totient is φ = 32096160.

The previous prime is 64400617. The next prime is 64400659. The reversal of 64400636 is 63600446.

It is a junction number, because it is equal to n+sod(n) for n = 64400599 and 64400608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24641 + ... + 27128.

It is an arithmetic number, because the mean of its divisors is an integer number (9422140).

Almost surely, 2^64400636 is an apocalyptic number.

It is an amenable number.

64400636 is a deficient number, since it is larger than the sum of its proper divisors (48665044).

64400636 is a wasteful number, since it uses less digits than its factorization.

64400636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52084 (or 52082 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 64400636 is about 8025.0006853582. Note that the first 3 decimals coincide. The cubic root of 64400636 is about 400.8329227288.

The spelling of 64400636 in words is "sixty-four million, four hundred thousand, six hundred thirty-six".