636279591090 has 64 divisors (see below), whose sum is σ = 1794041488512. Its totient is φ = 142384243200.

The previous prime is 636279591071. The next prime is 636279591119. The reversal of 636279591090 is 90195972636.

It is a self number, because there is not a number n which added to its sum of digits gives 636279591090.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74154171 + ... + 74162750.

It is an arithmetic number, because the mean of its divisors is an integer number (28031898258).

Almost surely, 2^636279591090 is an apocalyptic number.

636279591090 is an abundant number, since it is smaller than the sum of its proper divisors (1157761897422).

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

636279591090 is a wasteful number, since it uses less digits than its factorization.

636279591090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148316955.

The product of its (nonzero) digits is 5511240, while the sum is 57.

The spelling of 636279591090 in words is "six hundred thirty-six billion, two hundred seventy-nine million, five hundred ninety-one thousand, ninety".