998424720 has 120 divisors (see below), whose sum is σ = 3400443072. Its totient is φ = 262483200.

The previous prime is 998424703. The next prime is 998424751. The reversal of 998424720 is 27424899.

It is a tau number, because it is divible by the number of its divisors (120).

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 (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41355 + ... + 60885.

Almost surely, 2^998424720 is an apocalyptic number.

998424720 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 998424720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1700221536).

998424720 is an abundant number, since it is smaller than the sum of its proper divisors (2402018352).

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

998424720 is a wasteful number, since it uses less digits than its factorization.

998424720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19621 (or 19612 counting only the distinct ones).

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

The square root of 998424720 is about 31597.8594211697. The cubic root of 998424720 is about 999.4746307021.

The spelling of 998424720 in words is "nine hundred ninety-eight million, four hundred twenty-four thousand, seven hundred twenty".