998945478 has 48 divisors (see below), whose sum is σ = 2213804736. Its totient is φ = 325456560.

The previous prime is 998945477. The next prime is 998945489. The reversal of 998945478 is 874549899.

998945478 is a `hidden beast` number, since 9 + 9 + 89 + 4 + 547 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998945477) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 154825 + ... + 161147.

It is an arithmetic number, because the mean of its divisors is an integer number (46120932).

Almost surely, 2^998945478 is an apocalyptic number.

998945478 is an abundant number, since it is smaller than the sum of its proper divisors (1214859258).

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

998945478 is a wasteful number, since it uses less digits than its factorization.

998945478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6529 (or 6526 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 63.

The square root of 998945478 is about 31606.0987469191. The cubic root of 998945478 is about 999.6483690368.

The spelling of 998945478 in words is "nine hundred ninety-eight million, nine hundred forty-five thousand, four hundred seventy-eight".