64636420 has 12 divisors (see below), whose sum is σ = 135736524. Its totient is φ = 25854560.

The previous prime is 64636399. The next prime is 64636427. The reversal of 64636420 is 2463646.

64636420 is nontrivially palindromic in base 3.

It can be written as a sum of positive squares in 2 ways, for example, as 45346756 + 19289664 = 6734^2 + 4392^2 .

It is not an unprimeable number, because it can be changed into a prime (64636427) 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 3 ways as a sum of consecutive naturals, for example, 1615891 + ... + 1615930.

It is an arithmetic number, because the mean of its divisors is an integer number (11311377).

Almost surely, 2^64636420 is an apocalyptic number.

It is an amenable number.

64636420 is an abundant number, since it is smaller than the sum of its proper divisors (71100104).

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

64636420 is a wasteful number, since it uses less digits than its factorization.

64636420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3231830 (or 3231828 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 64636420 is about 8039.6778542427. The cubic root of 64636420 is about 401.3215042582.

It can be divided in two parts, 64636 and 420, that added together give a palindrome (65056).

The spelling of 64636420 in words is "sixty-four million, six hundred thirty-six thousand, four hundred twenty".