636669 has 24 divisors (see below), whose sum is σ = 1029600. Its totient is φ = 375840.

The previous prime is 636653. The next prime is 636673. The reversal of 636669 is 966636.

It is not a de Polignac number, because 636669 - 2⁴ = 636653 is a prime.

It is a super-2 number, since 2×636669² = 810694831122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636619) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5787 + ... + 5895.

It is an arithmetic number, because the mean of its divisors is an integer number (42900).

2⁶³⁶⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

636669 is a deficient number, since it is larger than the sum of its proper divisors (392931).

636669 is a wasteful number, since it uses less digits than its factorization.

636669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185 (or 182 counting only the distinct ones).

The product of its digits is 34992, while the sum is 36.

The square root of 636669 is about 797.9154090504. The cubic root of 636669 is about 86.0276186758.

The spelling of 636669 in words is "six hundred thirty-six thousand, six hundred sixty-nine".