998843680 has 72 divisors (see below), whose sum is σ = 2490647292. Its totient is φ = 378487296.

The previous prime is 998843617. The next prime is 998843693. The reversal of 998843680 is 86348899.

It can be written as a sum of positive squares in 2 ways, for example, as 874030096 + 124813584 = 29564^2 + 11172^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49114 + ... + 66406.

Almost surely, 2^998843680 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 998843680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1245323646).

998843680 is an abundant number, since it is smaller than the sum of its proper divisors (1491803612).

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

998843680 is a wasteful number, since it uses less digits than its factorization.

998843680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17346 (or 17319 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 55.

The square root of 998843680 is about 31604.4882888491. The cubic root of 998843680 is about 999.6144113405.

The spelling of 998843680 in words is "nine hundred ninety-eight million, eight hundred forty-three thousand, six hundred eighty".