18847344080 has 30 divisors (see below), whose sum is σ = 43822930086. Its totient is φ = 7538446464.

The previous prime is 18847344073. The next prime is 18847344091. The reversal of 18847344080 is 8044374881.

It can be written as a sum of positive squares in 3 ways, for example, as 426339904 + 18421004176 = 20648^2 + 135724^2 .

It is a super-2 number, since 2×18847344080² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1220246 + ... + 1235594.

Almost surely, 2^18847344080 is an apocalyptic number.

18847344080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18847344080 is an abundant number, since it is smaller than the sum of its proper divisors (24975586006).

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

18847344080 is an frugal number, since it uses more digits than its factorization.

18847344080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30711 (or 15356 counting only the distinct ones).

The product of its (nonzero) digits is 688128, while the sum is 47.

The spelling of 18847344080 in words is "eighteen billion, eight hundred forty-seven million, three hundred forty-four thousand, eighty".