18438182780 has 24 divisors (see below), whose sum is σ = 38731906752. Its totient is φ = 7373040192.

The previous prime is 18438182761. The next prime is 18438182839. The reversal of 18438182780 is 8728183481.

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, 71027 + ... + 204746.

It is an arithmetic number, because the mean of its divisors is an integer number (1613829448).

Almost surely, 2^18438182780 is an apocalyptic number.

18438182780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18438182780 is an abundant number, since it is smaller than the sum of its proper divisors (20293723972).

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

18438182780 is a wasteful number, since it uses less digits than its factorization.

18438182780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279125 (or 279123 counting only the distinct ones).

The product of its (nonzero) digits is 688128, while the sum is 50.

The spelling of 18438182780 in words is "eighteen billion, four hundred thirty-eight million, one hundred eighty-two thousand, seven hundred eighty".