636878130 has 64 divisors (see below), whose sum is σ = 1749116160. Its totient is φ = 145384704.

The previous prime is 636878129. The next prime is 636878141. The reversal of 636878130 is 31878636.

It is a super-2 number, since 2×636878130² = 811227504944593800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 223072 + ... + 225908.

It is an arithmetic number, because the mean of its divisors is an integer number (27329940).

Almost surely, 2^636878130 is an apocalyptic number.

636878130 is an abundant number, since it is smaller than the sum of its proper divisors (1112238030).

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

636878130 is a wasteful number, since it uses less digits than its factorization.

636878130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3923.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 636878130 is about 25236.4444801561. Note that the first 4 decimals coincide. The cubic root of 636878130 is about 860.3703695877.

It can be divided in two parts, 63687 and 8130, that added together give a palindrome (71817).

The spelling of 636878130 in words is "six hundred thirty-six million, eight hundred seventy-eight thousand, one hundred thirty".