636450042 has 16 divisors (see below), whose sum is σ = 1273186080. Its totient is φ = 212102352.

The previous prime is 636449999. The next prime is 636450047. The reversal of 636450042 is 240054636.

It is a junction number, because it is equal to n+sod(n) for n = 636449991 and 636450009.

It is not an unprimeable number, because it can be changed into a prime (636450047) 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, 26584 + ... + 44492.

It is an arithmetic number, because the mean of its divisors is an integer number (79574130).

Almost surely, 2^636450042 is an apocalyptic number.

636450042 is an abundant number, since it is smaller than the sum of its proper divisors (636736038).

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

636450042 is a wasteful number, since it uses less digits than its factorization.

636450042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23837.

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

The square root of 636450042 is about 25227.9615109901. The cubic root of 636450042 is about 860.1775557316.

The spelling of 636450042 in words is "six hundred thirty-six million, four hundred fifty thousand, forty-two".