636646040 has 16 divisors (see below), whose sum is σ = 1432453680. Its totient is φ = 254658400.

The previous prime is 636646007. The next prime is 636646051. The reversal of 636646040 is 40646636.

636646040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7958036 + ... + 7958115.

It is an arithmetic number, because the mean of its divisors is an integer number (89528355).

Almost surely, 2^636646040 is an apocalyptic number.

It is an amenable number.

636646040 is an abundant number, since it is smaller than the sum of its proper divisors (795807640).

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

636646040 is a wasteful number, since it uses less digits than its factorization.

636646040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15916162 (or 15916158 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 35.

The square root of 636646040 is about 25231.8457509553. The cubic root of 636646040 is about 860.2658453412.

The spelling of 636646040 in words is "six hundred thirty-six million, six hundred forty-six thousand, forty".