636928 has 24 divisors (see below), whose sum is σ = 1277640. Its totient is φ = 317440.

The previous prime is 636919. The next prime is 636931. The reversal of 636928 is 829636.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 636893 and 636902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1893 + ... + 2203.

It is an arithmetic number, because the mean of its divisors is an integer number (53235).

2⁶³⁶⁹²⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 636928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (638820).

636928 is an abundant number, since it is smaller than the sum of its proper divisors (640712).

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

636928 is an equidigital number, since it uses as much as digits as its factorization.

636928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333 (or 313 counting only the distinct ones).

The product of its digits is 15552, while the sum is 34.

The square root of 636928 is about 798.0776904538. The cubic root of 636928 is about 86.0392825768.

The spelling of 636928 in words is "six hundred thirty-six thousand, nine hundred twenty-eight".