636672 has 36 divisors (see below), whose sum is σ = 1696520. Its totient is φ = 211968.

The previous prime is 636653. The next prime is 636673. The reversal of 636672 is 276636.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636673) by changing a digit.

636672 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 in 3 ways as a sum of consecutive naturals, for example, 354 + ... + 1182.

2⁶³⁶⁶⁷² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 636672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (848260).

636672 is an abundant number, since it is smaller than the sum of its proper divisors (1059848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

636672 is an equidigital number, since it uses as much as digits as its factorization.

636672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848 (or 834 counting only the distinct ones).

The product of its digits is 9072, while the sum is 30.

The square root of 636672 is about 797.9172889467. The cubic root of 636672 is about 86.0277537970.

The spelling of 636672 in words is "six hundred thirty-six thousand, six hundred seventy-two".