998163840 has 256 divisors, whose sum is σ = 3438313920. Its totient is φ = 245366784.

The previous prime is 998163811. The next prime is 998163851. The reversal of 998163840 is 48361899.

It is a super-3 number, since 3×998163840³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 998163840.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1729632 + ... + 1730208.

Almost surely, 2^998163840 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 998163840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1719156960).

998163840 is an abundant number, since it is smaller than the sum of its proper divisors (2440150080).

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

998163840 is a wasteful number, since it uses less digits than its factorization.

998163840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669 (or 657 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 48.

The square root of 998163840 is about 31593.7310237332. The cubic root of 998163840 is about 999.3875716748.

The spelling of 998163840 in words is "nine hundred ninety-eight million, one hundred sixty-three thousand, eight hundred forty".