636480639 has 16 divisors (see below), whose sum is σ = 992563200. Its totient is φ = 401987448.

The previous prime is 636480617. The next prime is 636480641. The reversal of 636480639 is 936084636.

636480639 is a `hidden beast` number, since 6 + 3 + 6 + 4 + 8 + 0 + 639 = 666.

It is not a de Polignac number, because 636480639 - 2⁷ = 636480511 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 636480594 and 636480603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636480659) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 619839 + ... + 620864.

It is an arithmetic number, because the mean of its divisors is an integer number (62035200).

Almost surely, 2^636480639 is an apocalyptic number.

636480639 is a deficient number, since it is larger than the sum of its proper divisors (356082561).

636480639 is a wasteful number, since it uses less digits than its factorization.

636480639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240731 (or 1240725 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 45.

The square root of 636480639 is about 25228.5679141722. The cubic root of 636480639 is about 860.1913397048.

The spelling of 636480639 in words is "six hundred thirty-six million, four hundred eighty thousand, six hundred thirty-nine".