636744612 has 72 divisors (see below), whose sum is σ = 1731723840. Its totient is φ = 181567680.

The previous prime is 636744607. The next prime is 636744629. The reversal of 636744612 is 216447636.

It is a happy number.

It is a super-2 number, since 2×636744612² = 810887401822061088, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 482089 + ... + 483407.

It is an arithmetic number, because the mean of its divisors is an integer number (24051720).

Almost surely, 2^636744612 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 636744612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (865861920).

636744612 is an abundant number, since it is smaller than the sum of its proper divisors (1094979228).

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

636744612 is a wasteful number, since it uses less digits than its factorization.

636744612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2161 (or 2152 counting only the distinct ones).

The product of its digits is 145152, while the sum is 39.

The square root of 636744612 is about 25233.7990005469. The cubic root of 636744612 is about 860.3102414124.

It can be divided in two parts, 63674 and 4612, that added together give a palindrome (68286).

The spelling of 636744612 in words is "six hundred thirty-six million, seven hundred forty-four thousand, six hundred twelve".