636436 has 12 divisors (see below), whose sum is σ = 1124928. Its totient is φ = 315032.

The previous prime is 636421. The next prime is 636469. The reversal of 636436 is 634636.

It is a congruent number.

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, 316 + ... + 1171.

It is an arithmetic number, because the mean of its divisors is an integer number (93744).

2⁶³⁶⁴³⁶ is an apocalyptic number.

It is an amenable number.

636436 is a deficient number, since it is larger than the sum of its proper divisors (488492).

636436 is a wasteful number, since it uses less digits than its factorization.

636436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1598 (or 1596 counting only the distinct ones).

The product of its digits is 7776, while the sum is 28.

The square root of 636436 is about 797.7693902376. The cubic root of 636436 is about 86.0171229651.

It can be divided in two parts, 6364 and 36, that added together give a square (6400 = 80²).

The spelling of 636436 in words is "six hundred thirty-six thousand, four hundred thirty-six".