636444044 has 6 divisors (see below), whose sum is σ = 1113777084. Its totient is φ = 318222020.

The previous prime is 636444041. The next prime is 636444059. The reversal of 636444044 is 440444636.

It is a super-2 number, since 2×636444044² = 810122042286147872, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 636443995 and 636444013.

It is not an unprimeable number, because it can be changed into a prime (636444041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79555502 + ... + 79555509.

It is an arithmetic number, because the mean of its divisors is an integer number (185629514).

Almost surely, 2^636444044 is an apocalyptic number.

It is an amenable number.

636444044 is a deficient number, since it is larger than the sum of its proper divisors (477333040).

636444044 is a wasteful number, since it uses less digits than its factorization.

636444044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159111015 (or 159111013 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 35.

The square root of 636444044 is about 25227.8426346765. The cubic root of 636444044 is about 860.1748535760.

The spelling of 636444044 in words is "six hundred thirty-six million, four hundred forty-four thousand, forty-four".