18890660684 has 24 divisors (see below), whose sum is σ = 37824450720. Its totient is φ = 8086755456.

The previous prime is 18890660623. The next prime is 18890660693. The reversal of 18890660684 is 48606609881.

It is a super-2 number, since 2×18890660684² (a number of 21 digits) contains 22 as substring.

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, 360089 + ... + 409200.

It is an arithmetic number, because the mean of its divisors is an integer number (1576018780).

Almost surely, 2^18890660684 is an apocalyptic number.

18890660684 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18890660684 is an abundant number, since it is smaller than the sum of its proper divisors (18933790036).

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

18890660684 is a wasteful number, since it uses less digits than its factorization.

18890660684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770177 (or 770175 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 56.

The spelling of 18890660684 in words is "eighteen billion, eight hundred ninety million, six hundred sixty thousand, six hundred eighty-four".