636401006364 has 24 divisors (see below), whose sum is σ = 1485284950800. Its totient is φ = 212083773184.

The previous prime is 636401006359. The next prime is 636401006377. The reversal of 636401006364 is 463600104636.

It is a super-2 number, since 2×636401006364² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6183789 + ... + 6285860.

It is an arithmetic number, because the mean of its divisors is an integer number (61886872950).

Almost surely, 2^636401006364 is an apocalyptic number.

It is an amenable number.

636401006364 is an abundant number, since it is smaller than the sum of its proper divisors (848883944436).

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

636401006364 is a wasteful number, since it uses less digits than its factorization.

636401006364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12473909 (or 12473907 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 39.

The spelling of 636401006364 in words is "six hundred thirty-six billion, four hundred one million, six thousand, three hundred sixty-four".