998728478240 has 96 divisors (see below), whose sum is σ = 2414981169216. Its totient is φ = 390101806080.

The previous prime is 998728478227. The next prime is 998728478249. The reversal of 998728478240 is 42874827899.

It is not an unprimeable number, because it can be changed into a prime (998728478249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30826850 + ... + 30859230.

It is an arithmetic number, because the mean of its divisors is an integer number (25156053846).

Almost surely, 2^998728478240 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 998728478240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1207490584608).

998728478240 is an abundant number, since it is smaller than the sum of its proper divisors (1416252690976).

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

998728478240 is a wasteful number, since it uses less digits than its factorization.

998728478240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36922 (or 36914 counting only the distinct ones).

The product of its (nonzero) digits is 130056192, while the sum is 68.

The spelling of 998728478240 in words is "nine hundred ninety-eight billion, seven hundred twenty-eight million, four hundred seventy-eight thousand, two hundred forty".