253638636 has 12 divisors (see below), whose sum is σ = 591823512. Its totient is φ = 84546208.

The previous prime is 253638631. The next prime is 253638659. The reversal of 253638636 is 636836352.

253638636 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

253638636 is strictly pandigital in base 9.

It is not an unprimeable number, because it can be changed into a prime (253638631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10568265 + ... + 10568288.

It is an arithmetic number, because the mean of its divisors is an integer number (49318626).

Almost surely, 2^253638636 is an apocalyptic number.

It is an amenable number.

253638636 is an abundant number, since it is smaller than the sum of its proper divisors (338184876).

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

253638636 is a wasteful number, since it uses less digits than its factorization.

253638636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21136560 (or 21136558 counting only the distinct ones).

The product of its digits is 466560, while the sum is 42.

The square root of 253638636 is about 15926.0364183936. The cubic root of 253638636 is about 633.0020789122.

The spelling of 253638636 in words is "two hundred fifty-three million, six hundred thirty-eight thousand, six hundred thirty-six".