998656128 has 192 divisors, whose sum is σ = 3019991520. Its totient is φ = 328458240.

The previous prime is 998656117. The next prime is 998656181. The reversal of 998656128 is 821656899.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3016923 + ... + 3017253.

Almost surely, 2^998656128 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 998656128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1509995760).

998656128 is an abundant number, since it is smaller than the sum of its proper divisors (2021335392).

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

998656128 is an equidigital number, since it uses as much as digits as its factorization.

998656128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457 (or 433 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 54.

The square root of 998656128 is about 31601.5209760543. The cubic root of 998656128 is about 999.5518418509.

The spelling of 998656128 in words is "nine hundred ninety-eight million, six hundred fifty-six thousand, one hundred twenty-eight".