989898989898920 has 16 divisors (see below), whose sum is σ = 2227272727272660. Its totient is φ = 395959595959552.

The previous prime is 989898989898919. The next prime is 989898989898937. The reversal of 989898989898920 is 29898989898989.

It can be written as a sum of positive squares in 2 ways, for example, as 963217281490564 + 26681708408356 = 31035742^2 + 5165434^2 .

It is a junction number, because it is equal to n+sod(n) for n = 989898989898796 and 989898989898805.

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, 12373737373697 + ... + 12373737373776.

Almost surely, 2^{989898989898920} is an apocalyptic number.

It is an amenable number.

989898989898920 is an abundant number, since it is smaller than the sum of its proper divisors (1237373737373740).

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

989898989898920 is a wasteful number, since it uses less digits than its factorization.

989898989898920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24747474747484 (or 24747474747480 counting only the distinct ones).

The product of its (nonzero) digits is 2507653251072, while the sum is 113.

The spelling of 989898989898920 in words is "nine hundred eighty-nine trillion, eight hundred ninety-eight billion, nine hundred eighty-nine million, eight hundred ninety-eight thousand, nine hundred twenty".