636406944 has 24 divisors (see below), whose sum is σ = 1670568480. Its totient is φ = 212135616.

The previous prime is 636406933. The next prime is 636406963. The reversal of 636406944 is 449604636.

636406944 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (42) 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 = 636406896 and 636406905.

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, 3314524 + ... + 3314715.

It is an arithmetic number, because the mean of its divisors is an integer number (69607020).

Almost surely, 2^636406944 is an apocalyptic number.

It is an amenable number.

636406944 is an abundant number, since it is smaller than the sum of its proper divisors (1034161536).

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

636406944 is a wasteful number, since it uses less digits than its factorization.

636406944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6629252 (or 6629244 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 42.

The square root of 636406944 is about 25227.1073252563. The cubic root of 636406944 is about 860.1581392984.

The spelling of 636406944 in words is "six hundred thirty-six million, four hundred six thousand, nine hundred forty-four".