636252420 has 24 divisors (see below), whose sum is σ = 1781506944. Its totient is φ = 169667296.

The previous prime is 636252341. The next prime is 636252433. The reversal of 636252420 is 24252636.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5302044 + ... + 5302163.

It is an arithmetic number, because the mean of its divisors is an integer number (74229456).

Almost surely, 2^636252420 is an apocalyptic number.

636252420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

636252420 is an abundant number, since it is smaller than the sum of its proper divisors (1145254524).

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

636252420 is a wasteful number, since it uses less digits than its factorization.

636252420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10604219 (or 10604217 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 636252420 is about 25224.0444814070. The cubic root of 636252420 is about 860.0885162181.

The spelling of 636252420 in words is "six hundred thirty-six million, two hundred fifty-two thousand, four hundred twenty".