998628 has 12 divisors (see below), whose sum is σ = 2330160. Its totient is φ = 332872.

The previous prime is 998623. The next prime is 998629. The reversal of 998628 is 826899.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 998628.

It is not an unprimeable number, because it can be changed into a prime (998623) by changing a digit.

998628 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41598 + ... + 41621.

It is an arithmetic number, because the mean of its divisors is an integer number (194180).

2⁹⁹⁸⁶²⁸ is an apocalyptic number.

It is an amenable number.

998628 is an abundant number, since it is smaller than the sum of its proper divisors (1331532).

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

998628 is a wasteful number, since it uses less digits than its factorization.

998628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83226 (or 83224 counting only the distinct ones).

The product of its digits is 62208, while the sum is 42.

The square root of 998628 is about 999.3137645404. The cubic root of 998628 is about 99.9542457353.

The spelling of 998628 in words is "nine hundred ninety-eight thousand, six hundred twenty-eight".