998798000128 has 100 divisors (see below), whose sum is σ = 2052860088580. Its totient is φ = 485599739904.

The previous prime is 998798000107. The next prime is 998798000171. The reversal of 998798000128 is 821000897899.

It can be written as a sum of positive squares in 2 ways, for example, as 942359445504 + 56438554624 = 970752^2 + 237568^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 620756188 + ... + 620757796.

Almost surely, 2^998798000128 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 998798000128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1026430044290).

998798000128 is an abundant number, since it is smaller than the sum of its proper divisors (1054062088452).

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

998798000128 is an frugal number, since it uses more digits than its factorization.

998798000128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1694 (or 1648 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 61.

The spelling of 998798000128 in words is "nine hundred ninety-eight billion, seven hundred ninety-eight million, one hundred twenty-eight", and thus it is an aban number.