636998120 has 64 divisors (see below), whose sum is σ = 1573084800. Its totient is φ = 230222080.

The previous prime is 636998113. The next prime is 636998147. The reversal of 636998120 is 21899636.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69146 + ... + 77814.

It is an arithmetic number, because the mean of its divisors is an integer number (24579450).

Almost surely, 2^636998120 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 636998120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (786542400).

636998120 is an abundant number, since it is smaller than the sum of its proper divisors (936086680).

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

636998120 is a wasteful number, since it uses less digits than its factorization.

636998120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8858 (or 8854 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 636998120 is about 25238.8216840644. The cubic root of 636998120 is about 860.4243984268.

The spelling of 636998120 in words is "six hundred thirty-six million, nine hundred ninety-eight thousand, one hundred twenty".