636404402 has 8 divisors (see below), whose sum is σ = 955821936. Its totient is φ = 317797092.

The previous prime is 636404387. The next prime is 636404459. The reversal of 636404402 is 204404636.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200588 + ... + 203735.

It is an arithmetic number, because the mean of its divisors is an integer number (119477742).

Almost surely, 2^636404402 is an apocalyptic number.

636404402 is a deficient number, since it is larger than the sum of its proper divisors (319417534).

636404402 is a wasteful number, since it uses less digits than its factorization.

636404402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405112.

The product of its (nonzero) digits is 13824, while the sum is 29.

The square root of 636404402 is about 25227.0569428937. The cubic root of 636404402 is about 860.1569940538.

The spelling of 636404402 in words is "six hundred thirty-six million, four hundred four thousand, four hundred two".