998351497728 has 360 divisors, whose sum is σ = 3129565364640. Its totient is φ = 306243624960.

The previous prime is 998351497667. The next prime is 998351497739. The reversal of 998351497728 is 827794153899.

998351497728 is a `hidden beast` number, since 9 + 9 + 83 + 51 + 497 + 7 + 2 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 279570183 + ... + 279573753.

It is an arithmetic number, because the mean of its divisors is an integer number (8693237124).

Almost surely, 2^998351497728 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 998351497728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1564782682320).

998351497728 is an abundant number, since it is smaller than the sum of its proper divisors (2131213866912).

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

998351497728 is a wasteful number, since it uses less digits than its factorization.

998351497728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3980 (or 3948 counting only the distinct ones).

The product of its digits is 274337280, while the sum is 72.

The spelling of 998351497728 in words is "nine hundred ninety-eight billion, three hundred fifty-one million, four hundred ninety-seven thousand, seven hundred twenty-eight".