636438028 has 12 divisors (see below), whose sum is σ = 1113955192. Its totient is φ = 318165120.

The previous prime is 636438013. The next prime is 636438059. The reversal of 636438028 is 820834636.

636438028 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

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, 25843 + ... + 44053.

Almost surely, 2^636438028 is an apocalyptic number.

It is an amenable number.

636438028 is a deficient number, since it is larger than the sum of its proper divisors (477517164).

636438028 is a wasteful number, since it uses less digits than its factorization.

636438028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26952 (or 26950 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 40.

The square root of 636438028 is about 25227.7234010523. The cubic root of 636438028 is about 860.1721432941.

The spelling of 636438028 in words is "six hundred thirty-six million, four hundred thirty-eight thousand, twenty-eight".