18128859840 has 1008 divisors, whose sum is σ = 81967474368. Its totient is φ = 3588489216.

The previous prime is 18128859811. The next prime is 18128859841. The reversal of 18128859840 is 4895882181.

18128859840 is a `hidden beast` number, since 1 + 8 + 1 + 2 + 8 + 8 + 598 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (1008).

It is not an unprimeable number, because it can be changed into a prime (18128859841) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 57919524 + ... + 57919836.

Almost surely, 2^18128859840 is an apocalyptic number.

18128859840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18128859840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40983737184).

18128859840 is an abundant number, since it is smaller than the sum of its proper divisors (63838614528).

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

18128859840 is a wasteful number, since it uses less digits than its factorization.

18128859840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386 (or 360 counting only the distinct ones).

The product of its (nonzero) digits is 1474560, while the sum is 54.

The spelling of 18128859840 in words is "eighteen billion, one hundred twenty-eight million, eight hundred fifty-nine thousand, eight hundred forty".