636456140 has 24 divisors (see below), whose sum is σ = 1364997312. Its totient is φ = 249165440.

The previous prime is 636456113. The next prime is 636456143. The reversal of 636456140 is 41654636.

It is a self number, because there is not a number n which added to its sum of digits gives 636456140.

It is not an unprimeable number, because it can be changed into a prime (636456143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 337601 + ... + 339480.

It is an arithmetic number, because the mean of its divisors is an integer number (56874888).

Almost surely, 2^636456140 is an apocalyptic number.

It is an amenable number.

636456140 is an abundant number, since it is smaller than the sum of its proper divisors (728541172).

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

636456140 is a wasteful number, since it uses less digits than its factorization.

636456140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677137 (or 677135 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 636456140 is about 25228.0823686621. The cubic root of 636456140 is about 860.1803029207.

The spelling of 636456140 in words is "six hundred thirty-six million, four hundred fifty-six thousand, one hundred forty".