636245420 has 24 divisors (see below), whose sum is σ = 1349091744. Its totient is φ = 252026496.

The previous prime is 636245371. The next prime is 636245431. The reversal of 636245420 is 24542636.

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, 152369 + ... + 156488.

It is an arithmetic number, because the mean of its divisors is an integer number (56212156).

Almost surely, 2^636245420 is an apocalyptic number.

It is an amenable number.

636245420 is an abundant number, since it is smaller than the sum of its proper divisors (712846324).

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

636245420 is a wasteful number, since it uses less digits than its factorization.

636245420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308969 (or 308967 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 32.

The square root of 636245420 is about 25223.9057245304. The cubic root of 636245420 is about 860.0853619974.

The spelling of 636245420 in words is "six hundred thirty-six million, two hundred forty-five thousand, four hundred twenty".