636863140 has 24 divisors (see below), whose sum is σ = 1357376832. Its totient is φ = 250942560.

The previous prime is 636863131. The next prime is 636863167. The reversal of 636863140 is 41368636.

636863140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 636863140.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236296 + ... + 238975.

It is an arithmetic number, because the mean of its divisors is an integer number (56557368).

Almost surely, 2^636863140 is an apocalyptic number.

It is an amenable number.

636863140 is an abundant number, since it is smaller than the sum of its proper divisors (720513692).

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

636863140 is a wasteful number, since it uses less digits than its factorization.

636863140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475347 (or 475345 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 636863140 is about 25236.1474872850. The cubic root of 636863140 is about 860.3636194459.

The spelling of 636863140 in words is "six hundred thirty-six million, eight hundred sixty-three thousand, one hundred forty".