636243620 has 12 divisors (see below), whose sum is σ = 1336111644. Its totient is φ = 254497440.

The previous prime is 636243593. The next prime is 636243623. The reversal of 636243620 is 26342636.

636243620 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 2 ways, for example, as 484264036 + 151979584 = 22006^2 + 12328^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (636243623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15906071 + ... + 15906110.

It is an arithmetic number, because the mean of its divisors is an integer number (111342637).

Almost surely, 2^636243620 is an apocalyptic number.

It is an amenable number.

636243620 is an abundant number, since it is smaller than the sum of its proper divisors (699868024).

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

636243620 is a wasteful number, since it uses less digits than its factorization.

636243620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31812190 (or 31812188 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 32.

The square root of 636243620 is about 25223.8700440674. The cubic root of 636243620 is about 860.0845509083.

The spelling of 636243620 in words is "six hundred thirty-six million, two hundred forty-three thousand, six hundred twenty".