636712 has 8 divisors (see below), whose sum is σ = 1193850. Its totient is φ = 318352.

The previous prime is 636697. The next prime is 636719. The reversal of 636712 is 217636.

636712 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 599076 + 37636 = 774^2 + 194^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (636719) by changing a digit.

636712 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 as a sum of consecutive naturals, namely, 39787 + ... + 39802.

2⁶³⁶⁷¹² is an apocalyptic number.

It is an amenable number.

636712 is a deficient number, since it is larger than the sum of its proper divisors (557138).

636712 is a wasteful number, since it uses less digits than its factorization.

636712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79595 (or 79591 counting only the distinct ones).

The product of its digits is 1512, while the sum is 25.

The square root of 636712 is about 797.9423538076. The cubic root of 636712 is about 86.0295553725.

The spelling of 636712 in words is "six hundred thirty-six thousand, seven hundred twelve".