998664 has 16 divisors (see below), whose sum is σ = 2496720. Its totient is φ = 332880.

The previous prime is 998653. The next prime is 998681. The reversal of 998664 is 466899.

998664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20782 + ... + 20829.

It is an arithmetic number, because the mean of its divisors is an integer number (156045).

2⁹⁹⁸⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

998664 is an abundant number, since it is smaller than the sum of its proper divisors (1498056).

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

998664 is a wasteful number, since it uses less digits than its factorization.

998664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41620 (or 41616 counting only the distinct ones).

The product of its digits is 93312, while the sum is 42.

The square root of 998664 is about 999.3317767388. The cubic root of 998664 is about 99.9554468198.

The spelling of 998664 in words is "nine hundred ninety-eight thousand, six hundred sixty-four".