18240251328 has 140 divisors (see below), whose sum is σ = 58229251080. Its totient is φ = 5612364288.

The previous prime is 18240251321. The next prime is 18240251329. The reversal of 18240251328 is 82315204281.

It is a happy number.

18240251328 is a `hidden beast` number, since 1 + 82 + 4 + 0 + 251 + 328 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18240251292 and 18240251301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18240251321) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 67938 + ... + 202721.

It is an arithmetic number, because the mean of its divisors is an integer number (415923222).

Almost surely, 2^18240251328 is an apocalyptic number.

18240251328 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18240251328 is an abundant number, since it is smaller than the sum of its proper divisors (39988999752).

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

18240251328 is a wasteful number, since it uses less digits than its factorization.

18240251328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270696 (or 270677 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The spelling of 18240251328 in words is "eighteen billion, two hundred forty million, two hundred fifty-one thousand, three hundred twenty-eight".