18404987328 has 168 divisors, whose sum is σ = 64928890208. Its totient is φ = 4854048768.

The previous prime is 18404987303. The next prime is 18404987347. The reversal of 18404987328 is 82378940481.

It is a happy number.

18404987328 is a `hidden beast` number, since 1 + 84 + 0 + 498 + 73 + 2 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (168).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 123151 + ... + 227982.

Almost surely, 2^18404987328 is an apocalyptic number.

18404987328 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18404987328 is an abundant number, since it is smaller than the sum of its proper divisors (46523902880).

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

18404987328 is a wasteful number, since it uses less digits than its factorization.

18404987328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351171 (or 351158 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 54.

The spelling of 18404987328 in words is "eighteen billion, four hundred four million, nine hundred eighty-seven thousand, three hundred twenty-eight".