998578 has 8 divisors (see below), whose sum is σ = 1711872. Its totient is φ = 427956.

The previous prime is 998561. The next prime is 998617. The reversal of 998578 is 875899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

998578 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, 35650 + ... + 35677.

It is an arithmetic number, because the mean of its divisors is an integer number (213984).

2⁹⁹⁸⁵⁷⁸ is an apocalyptic number.

998578 is a deficient number, since it is larger than the sum of its proper divisors (713294).

998578 is a wasteful number, since it uses less digits than its factorization.

998578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71336.

The product of its digits is 181440, while the sum is 46.

The square root of 998578 is about 999.2887470596. The cubic root of 998578 is about 99.9525775146.

The spelling of 998578 in words is "nine hundred ninety-eight thousand, five hundred seventy-eight".