636667 has 6 divisors (see below), whose sum is σ = 676628. Its totient is φ = 598944.

The previous prime is 636653. The next prime is 636673. The reversal of 636667 is 766636.

It is not a de Polignac number, because 636667 - 2⁷ = 636539 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (636697) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 813 + ... + 1390.

2⁶³⁶⁶⁶⁷ is an apocalyptic number.

636667 is a deficient number, since it is larger than the sum of its proper divisors (39961).

636667 is a wasteful number, since it uses less digits than its factorization.

636667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2237 (or 2220 counting only the distinct ones).

The product of its digits is 27216, while the sum is 34.

The square root of 636667 is about 797.9141557837. The cubic root of 636667 is about 86.0275285948.

The spelling of 636667 in words is "six hundred thirty-six thousand, six hundred sixty-seven".