998442720 has 192 divisors, whose sum is σ = 3812417280. Its totient is φ = 242035200.

The previous prime is 998442713. The next prime is 998442749. The reversal of 998442720 is 27244899.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37015 + ... + 58025.

It is an arithmetic number, because the mean of its divisors is an integer number (19856340).

Almost surely, 2^998442720 is an apocalyptic number.

998442720 is a gapful number since it is divisible by the number (90) 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 998442720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1906208640).

998442720 is an abundant number, since it is smaller than the sum of its proper divisors (2813974560).

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

998442720 is a wasteful number, since it uses less digits than its factorization.

998442720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21046 (or 21032 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 998442720 is about 31598.1442493068. The cubic root of 998442720 is about 999.4806369754.

The spelling of 998442720 in words is "nine hundred ninety-eight million, four hundred forty-two thousand, seven hundred twenty".