64636 has 24 divisors (see below), whose sum is σ = 134064. Its totient is φ = 26880.

The previous prime is 64633. The next prime is 64661. The reversal of 64636 is 63646.

It is a happy number.

64636 is nontrivially palindromic in base 15.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 64636.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 516 + ... + 628.

It is an arithmetic number, because the mean of its divisors is an integer number (5586).

2⁶⁴⁶³⁶ is an apocalyptic number.

It is an amenable number.

64636 is an abundant number, since it is smaller than the sum of its proper divisors (69428).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67032).

64636 is a wasteful number, since it uses less digits than its factorization.

64636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141 (or 139 counting only the distinct ones).

The product of its digits is 2592, while the sum is 25.

The square root of 64636 is about 254.2361107317. The cubic root of 64636 is about 40.1320635009.

Subtracting from 64636 its reverse (63646), we obtain a triangular number (990 = T₄₄).

It can be divided in two parts, 64 and 636, that multiplied together give a palindrome (40704).

The spelling of 64636 in words is "sixty-four thousand, six hundred thirty-six".