636255740 has 24 divisors (see below), whose sum is σ = 1337312592. Its totient is φ = 254278400.

The previous prime is 636255733. The next prime is 636255743. The reversal of 636255740 is 47552636.

It is a junction number, because it is equal to n+sod(n) for n = 636255694 and 636255703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636255743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10340 + ... + 37140.

It is an arithmetic number, because the mean of its divisors is an integer number (55721358).

Almost surely, 2^636255740 is an apocalyptic number.

It is an amenable number.

636255740 is an abundant number, since it is smaller than the sum of its proper divisors (701056852).

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

636255740 is a wasteful number, since it uses less digits than its factorization.

636255740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27997 (or 27995 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 38.

The square root of 636255740 is about 25224.1102915445. The cubic root of 636255740 is about 860.0900122118.

The spelling of 636255740 in words is "six hundred thirty-six million, two hundred fifty-five thousand, seven hundred forty".