18857273808 has 80 divisors (see below), whose sum is σ = 49489193600. Its totient is φ = 6186585600.

The previous prime is 18857273803. The next prime is 18857273861. The reversal of 18857273808 is 80837275881.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18857273801) 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, 778098 + ... + 801966.

It is an arithmetic number, because the mean of its divisors is an integer number (618614920).

Almost surely, 2^18857273808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18857273808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24744596800).

18857273808 is an abundant number, since it is smaller than the sum of its proper divisors (30631919792).

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

18857273808 is a wasteful number, since it uses less digits than its factorization.

18857273808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24140 (or 24134 counting only the distinct ones).

The product of its (nonzero) digits is 6021120, while the sum is 57.

The spelling of 18857273808 in words is "eighteen billion, eight hundred fifty-seven million, two hundred seventy-three thousand, eight hundred eight".