64665636 has 48 divisors (see below), whose sum is σ = 176461824. Its totient is φ = 18045216.

The previous prime is 64665619. The next prime is 64665649. The reversal of 64665636 is 63656646.

It is a happy number.

64665636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 5340 + ... + 12563.

It is an arithmetic number, because the mean of its divisors is an integer number (3676288).

Almost surely, 2^64665636 is an apocalyptic number.

It is an amenable number.

64665636 is an abundant number, since it is smaller than the sum of its proper divisors (111796188).

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

64665636 is a wasteful number, since it uses less digits than its factorization.

64665636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17960 (or 17958 counting only the distinct ones).

The product of its digits is 466560, while the sum is 42.

The square root of 64665636 is about 8041.4946371928. The cubic root of 64665636 is about 401.3819616233.

The spelling of 64665636 in words is "sixty-four million, six hundred sixty-five thousand, six hundred thirty-six".