998531028 has 72 divisors (see below), whose sum is σ = 2780371776. Its totient is φ = 299635200.

The previous prime is 998531003. The next prime is 998531029. The reversal of 998531028 is 820135899.

It is a happy number.

998531028 is a `hidden beast` number, since 9 + 98 + 531 + 0 + 28 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998531029) 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 23 ways as a sum of consecutive naturals, for example, 28548 + ... + 53028.

Almost surely, 2^998531028 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 998531028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1390185888).

998531028 is an abundant number, since it is smaller than the sum of its proper divisors (1781840748).

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

998531028 is a wasteful number, since it uses less digits than its factorization.

998531028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24605 (or 24600 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 998531028 is about 31599.5415789533. The cubic root of 998531028 is about 999.5101027065.

The spelling of 998531028 in words is "nine hundred ninety-eight million, five hundred thirty-one thousand, twenty-eight".