998728 has 16 divisors (see below), whose sum is σ = 1889280. Its totient is φ = 494928.

The previous prime is 998717. The next prime is 998737. The reversal of 998728 is 827899.

It is an unprimeable number.

998728 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 3 ways as a sum of consecutive naturals, for example, 525 + ... + 1507.

It is an arithmetic number, because the mean of its divisors is an integer number (118080).

2⁹⁹⁸⁷²⁸ is an apocalyptic number.

It is an amenable number.

998728 is a deficient number, since it is larger than the sum of its proper divisors (890552).

998728 is a wasteful number, since it uses less digits than its factorization.

998728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116 (or 1112 counting only the distinct ones).

The product of its digits is 72576, while the sum is 43.

The square root of 998728 is about 999.3637976233. The cubic root of 998728 is about 99.9575820097.

The spelling of 998728 in words is "nine hundred ninety-eight thousand, seven hundred twenty-eight".