18213767928 has 48 divisors (see below), whose sum is σ = 49576878000. Its totient is φ = 6040742400.

The previous prime is 18213767917. The next prime is 18213767933. The reversal of 18213767928 is 82976731281.

It is a happy number.

18213767928 is a `hidden beast` number, since 182 + 1 + 376 + 7 + 92 + 8 = 666.

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, 621273 + ... + 649928.

It is an arithmetic number, because the mean of its divisors is an integer number (1032851625).

Almost surely, 2^18213767928 is an apocalyptic number.

18213767928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18213767928 is an abundant number, since it is smaller than the sum of its proper divisors (31363110072).

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

18213767928 is a wasteful number, since it uses less digits than its factorization.

18213767928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271412 (or 1271405 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The spelling of 18213767928 in words is "eighteen billion, two hundred thirteen million, seven hundred sixty-seven thousand, nine hundred twenty-eight".