18998867328 has 512 divisors, whose sum is σ = 62643732480. Its totient is φ = 4987699200.

The previous prime is 18998867323. The next prime is 18998867401. The reversal of 18998867328 is 82376889981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18998867323) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 228901975 + ... + 228902057.

It is an arithmetic number, because the mean of its divisors is an integer number (122351040).

Almost surely, 2^18998867328 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18998867328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31321866240).

18998867328 is an abundant number, since it is smaller than the sum of its proper divisors (43644865152).

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

18998867328 is a wasteful number, since it uses less digits than its factorization.

18998867328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246 (or 234 counting only the distinct ones).

The product of its digits is 83607552, while the sum is 69.

The spelling of 18998867328 in words is "eighteen billion, nine hundred ninety-eight million, eight hundred sixty-seven thousand, three hundred twenty-eight".