18090778968 has 48 divisors (see below), whose sum is σ = 49002046080. Its totient is φ = 6029498304.

The previous prime is 18090778949. The next prime is 18090779011. The reversal of 18090778968 is 86987709081.

It is a super-2 number, since 2×18090778968² (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 11 ways as a sum of consecutive naturals, for example, 1091721 + ... + 1108167.

It is an arithmetic number, because the mean of its divisors is an integer number (1020875960).

Almost surely, 2^18090778968 is an apocalyptic number.

18090778968 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18090778968 is an abundant number, since it is smaller than the sum of its proper divisors (30911267112).

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

18090778968 is a wasteful number, since it uses less digits than its factorization.

18090778968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31736 (or 31729 counting only the distinct ones).

The product of its (nonzero) digits is 12192768, while the sum is 63.

The spelling of 18090778968 in words is "eighteen billion, ninety million, seven hundred seventy-eight thousand, nine hundred sixty-eight".