18700491860 has 12 divisors (see below), whose sum is σ = 39271032948. Its totient is φ = 7480196736.

The previous prime is 18700491853. The next prime is 18700491869. The reversal of 18700491860 is 6819400781.

It can be written as a sum of positive squares in 2 ways, for example, as 11736255556 + 6964236304 = 108334^2 + 83452^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18700491869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 467512277 + ... + 467512316.

It is an arithmetic number, because the mean of its divisors is an integer number (3272586079).

Almost surely, 2^18700491860 is an apocalyptic number.

18700491860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18700491860 is an abundant number, since it is smaller than the sum of its proper divisors (20570541088).

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

18700491860 is a wasteful number, since it uses less digits than its factorization.

18700491860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935024602 (or 935024600 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 44.

The spelling of 18700491860 in words is "eighteen billion, seven hundred million, four hundred ninety-one thousand, eight hundred sixty".