17998008840 has 384 divisors, whose sum is σ = 70182927360. Its totient is φ = 4062991104.

The previous prime is 17998008803. The next prime is 17998008841. The reversal of 17998008840 is 4880089971.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (17998008841) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5645727 + ... + 5648913.

It is an arithmetic number, because the mean of its divisors is an integer number (182768040).

Almost surely, 2^17998008840 is an apocalyptic number.

17998008840 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 17998008840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35091463680).

17998008840 is an abundant number, since it is smaller than the sum of its proper divisors (52184918520).

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

17998008840 is a wasteful number, since it uses less digits than its factorization.

17998008840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3303 (or 3287 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 54.

The spelling of 17998008840 in words is "seventeen billion, nine hundred ninety-eight million, eight thousand, eight hundred forty".