635728 has 10 divisors (see below), whose sum is σ = 1231754. Its totient is φ = 317856.

The previous prime is 635711. The next prime is 635729. The reversal of 635728 is 827536.

It can be written as a sum of positive squares in only one way, i.e., 627264 + 8464 = 792^2 + 92^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 635728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (635729) by changing a digit.

635728 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19851 + ... + 19882.

2⁶³⁵⁷²⁸ is an apocalyptic number.

It is an amenable number.

635728 is a deficient number, since it is larger than the sum of its proper divisors (596026).

635728 is a wasteful number, since it uses less digits than its factorization.

635728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39741 (or 39735 counting only the distinct ones).

The product of its digits is 10080, while the sum is 31.

The square root of 635728 is about 797.3255295047. The cubic root of 635728 is about 85.9852146928.

The spelling of 635728 in words is "six hundred thirty-five thousand, seven hundred twenty-eight".