64636512 has 24 divisors (see below), whose sum is σ = 169671096. Its totient is φ = 21545472.

The previous prime is 64636493. The next prime is 64636543. The reversal of 64636512 is 21563646.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×64636512² = 8355757367052288, which contains 22 as substring.

It is a plaindrome in base 9.

It is a congruent number.

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, 336553 + ... + 336744.

It is an arithmetic number, because the mean of its divisors is an integer number (7069629).

Almost surely, 2^64636512 is an apocalyptic number.

It is an amenable number.

64636512 is an abundant number, since it is smaller than the sum of its proper divisors (105034584).

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

64636512 is a wasteful number, since it uses less digits than its factorization.

64636512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673310 (or 673302 counting only the distinct ones).

The product of its digits is 25920, while the sum is 33.

The square root of 64636512 is about 8039.6835758629. The cubic root of 64636512 is about 401.3216946646.

The spelling of 64636512 in words is "sixty-four million, six hundred thirty-six thousand, five hundred twelve".