636045421 has 16 divisors (see below), whose sum is σ = 708341760. Its totient is φ = 566205120.

The previous prime is 636045413. The next prime is 636045433. The reversal of 636045421 is 124540636.

636045421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 636045421 - 2³ = 636045413 is a prime.

It is a super-3 number, since 3×636045421³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636045451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 496660 + ... + 497938.

It is an arithmetic number, because the mean of its divisors is an integer number (44271360).

Almost surely, 2^636045421 is an apocalyptic number.

It is an amenable number.

636045421 is a deficient number, since it is larger than the sum of its proper divisors (72296339).

636045421 is a wasteful number, since it uses less digits than its factorization.

636045421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2196.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 636045421 is about 25219.9409396612. The cubic root of 636045421 is about 859.9952320810.

The spelling of 636045421 in words is "six hundred thirty-six million, forty-five thousand, four hundred twenty-one".