636140870 has 16 divisors (see below), whose sum is σ = 1145381040. Its totient is φ = 254383584.

The previous prime is 636140837. The next prime is 636140893. The reversal of 636140870 is 78041636.

It is a self number, because there is not a number n which added to its sum of digits gives 636140870.

It is a congruent number.

It is an unprimeable number.

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, 40496 + ... + 53964.

It is an arithmetic number, because the mean of its divisors is an integer number (71586315).

Almost surely, 2^636140870 is an apocalyptic number.

636140870 is a deficient number, since it is larger than the sum of its proper divisors (509240170).

636140870 is a wasteful number, since it uses less digits than its factorization.

636140870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18199.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 636140870 is about 25221.8332006220. The cubic root of 636140870 is about 860.0382487045.

The spelling of 636140870 in words is "six hundred thirty-six million, one hundred forty thousand, eight hundred seventy".