998998560 has 576 divisors, whose sum is σ = 4226826240. Its totient is φ = 209848320.

The previous prime is 998998519. The next prime is 998998571. The reversal of 998998560 is 65899899.

It is a Harshad number since it is a multiple of its sum of digits (63).

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, 7186971 + ... + 7187109.

It is an arithmetic number, because the mean of its divisors is an integer number (7338240).

Almost surely, 2^998998560 is an apocalyptic number.

998998560 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 998998560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2113413120).

998998560 is an abundant number, since it is smaller than the sum of its proper divisors (3227827680).

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

998998560 is a wasteful number, since it uses less digits than its factorization.

998998560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 210 counting only the distinct ones).

The product of its (nonzero) digits is 12597120, while the sum is 63.

The square root of 998998560 is about 31606.9384787581. The cubic root of 998998560 is about 999.6660751733. Note that the first 3 decimals are identical.

The spelling of 998998560 in words is "nine hundred ninety-eight million, nine hundred ninety-eight thousand, five hundred sixty".