18787423788 has 54 divisors (see below), whose sum is σ = 55243977516. Its totient is φ = 5367834864.

The previous prime is 18787423769. The next prime is 18787423871. The reversal of 18787423788 is 88732478781.

18787423788 is a `hidden beast` number, since 187 + 87 + 4 + 2 + 378 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5323470 + ... + 5326997.

Almost surely, 2^18787423788 is an apocalyptic number.

18787423788 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18787423788 is an abundant number, since it is smaller than the sum of its proper divisors (36456553728).

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

18787423788 is a wasteful number, since it uses less digits than its factorization.

18787423788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10650491 (or 10650479 counting only the distinct ones).

The product of its digits is 33718272, while the sum is 63.

The spelling of 18787423788 in words is "eighteen billion, seven hundred eighty-seven million, four hundred twenty-three thousand, seven hundred eighty-eight".