636728 has 32 divisors (see below), whose sum is σ = 1296000. Its totient is φ = 292320.

The previous prime is 636721. The next prime is 636731. The reversal of 636728 is 827636.

It is a junction number, because it is equal to n+sod(n) for n = 636694 and 636703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8933 + ... + 9003.

It is an arithmetic number, because the mean of its divisors is an integer number (40500).

636728 is a Friedman number, since it can be written as 672+86^3, using all its digits and the basic arithmetic operations.

2⁶³⁶⁷²⁸ is an apocalyptic number.

It is an amenable number.

636728 is an abundant number, since it is smaller than the sum of its proper divisors (659272).

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

636728 is a wasteful number, since it uses less digits than its factorization.

636728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155 (or 151 counting only the distinct ones).

The product of its digits is 12096, while the sum is 32.

The square root of 636728 is about 797.9523795315. The cubic root of 636728 is about 86.0302759816.

The spelling of 636728 in words is "six hundred thirty-six thousand, seven hundred twenty-eight".