636744 has 32 divisors (see below), whose sum is σ = 1631520. Its totient is φ = 206976.

The previous prime is 636739. The next prime is 636749. The reversal of 636744 is 447636.

636744 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (636739) and next prime (636749).

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (636749) by changing a digit.

636744 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 7 ways as a sum of consecutive naturals, for example, 724 + ... + 1340.

It is an arithmetic number, because the mean of its divisors is an integer number (50985).

2⁶³⁶⁷⁴⁴ 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 636744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (815760).

636744 is an abundant number, since it is smaller than the sum of its proper divisors (994776).

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

636744 is a wasteful number, since it uses less digits than its factorization.

636744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669 (or 665 counting only the distinct ones).

The product of its digits is 12096, while the sum is 30.

The square root of 636744 is about 797.9624051295. The cubic root of 636744 is about 86.0309965786.

The spelling of 636744 in words is "six hundred thirty-six thousand, seven hundred forty-four".