636724 has 24 divisors (see below), whose sum is σ = 1260000. Its totient is φ = 278880.

The previous prime is 636721. The next prime is 636731. The reversal of 636724 is 427636.

It is a junction number, because it is equal to n+sod(n) for n = 636692 and 636701.

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, 1027 + ... + 1525.

It is an arithmetic number, because the mean of its divisors is an integer number (52500).

2⁶³⁶⁷²⁴ is an apocalyptic number.

It is an amenable number.

636724 is a deficient number, since it is larger than the sum of its proper divisors (623276).

636724 is a wasteful number, since it uses less digits than its factorization.

636724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543 (or 541 counting only the distinct ones).

The product of its digits is 6048, while the sum is 28.

The square root of 636724 is about 797.9498731123. The cubic root of 636724 is about 86.0300958305.

The spelling of 636724 in words is "six hundred thirty-six thousand, seven hundred twenty-four".