8636544020 has 24 divisors (see below), whose sum is σ = 19531877064. Its totient is φ = 3188877696.

The previous prime is 8636544013. The next prime is 8636544061. The reversal of 8636544020 is 204456368.

It can be written as a sum of positive squares in 4 ways, for example, as 72522256 + 8564021764 = 8516^2 + 92542^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16608479 + ... + 16608998.

It is an arithmetic number, because the mean of its divisors is an integer number (813828211).

Almost surely, 2^8636544020 is an apocalyptic number.

It is an amenable number.

8636544020 is an abundant number, since it is smaller than the sum of its proper divisors (10895333044).

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

8636544020 is a wasteful number, since it uses less digits than its factorization.

8636544020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33217499 (or 33217497 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 38.

The square root of 8636544020 is about 92933.0082371167. The cubic root of 8636544020 is about 2051.6975049567.

The spelling of 8636544020 in words is "eight billion, six hundred thirty-six million, five hundred forty-four thousand, twenty".