17998727040 has 768 divisors, whose sum is σ = 76814568000. Its totient is φ = 3966713856.

The previous prime is 17998727017. The next prime is 17998727077. The reversal of 17998727040 is 4072789971.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 24554514 + ... + 24555246.

Almost surely, 2^17998727040 is an apocalyptic number.

17998727040 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 17998727040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38407284000).

17998727040 is an abundant number, since it is smaller than the sum of its proper divisors (58815840960).

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

17998727040 is a wasteful number, since it uses less digits than its factorization.

17998727040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804 (or 779 counting only the distinct ones).

The product of its (nonzero) digits is 1778112, while the sum is 54.

The spelling of 17998727040 in words is "seventeen billion, nine hundred ninety-eight million, seven hundred twenty-seven thousand, forty".