64653636 has 12 divisors (see below), whose sum is σ = 150858512. Its totient is φ = 21551208.

The previous prime is 64653607. The next prime is 64653647. The reversal of 64653636 is 63635646.

It is a happy number.

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

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 64653594 and 64653603.

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, 2693890 + ... + 2693913.

Almost surely, 2^64653636 is an apocalyptic number.

It is an amenable number.

64653636 is an abundant number, since it is smaller than the sum of its proper divisors (86204876).

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

64653636 is a wasteful number, since it uses less digits than its factorization.

64653636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5387810 (or 5387808 counting only the distinct ones).

The product of its digits is 233280, while the sum is 39.

The square root of 64653636 is about 8040.7484726237. The cubic root of 64653636 is about 401.3571319415.

It can be divided in two parts, 6465 and 3636, that added together give a palindrome (10101).

The spelling of 64653636 in words is "sixty-four million, six hundred fifty-three thousand, six hundred thirty-six".