636520490 has 32 divisors (see below), whose sum is σ = 1178343936. Its totient is φ = 247411840.

The previous prime is 636520453. The next prime is 636520517. The reversal of 636520490 is 94025636.

It is a self number, because there is not a number n which added to its sum of digits gives 636520490.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104879 + ... + 110781.

It is an arithmetic number, because the mean of its divisors is an integer number (36823248).

Almost surely, 2^636520490 is an apocalyptic number.

636520490 is a deficient number, since it is larger than the sum of its proper divisors (541823446).

636520490 is a wasteful number, since it uses less digits than its factorization.

636520490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6214.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 636520490 is about 25229.3577009008. The cubic root of 636520490 is about 860.2092919501.

The spelling of 636520490 in words is "six hundred thirty-six million, five hundred twenty thousand, four hundred ninety".