989555988 has 12 divisors (see below), whose sum is σ = 2308964000. Its totient is φ = 329851992.

The previous prime is 989555981. The next prime is 989555989. The reversal of 989555988 is 889555989.

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

It is a super-2 number, since 2×989555988² = 1958442106773312288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989555981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41231488 + ... + 41231511.

Almost surely, 2^989555988 is an apocalyptic number.

It is an amenable number.

989555988 is an abundant number, since it is smaller than the sum of its proper divisors (1319408012).

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

989555988 is a wasteful number, since it uses less digits than its factorization.

989555988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82463006 (or 82463004 counting only the distinct ones).

The product of its digits is 46656000, while the sum is 66.

The square root of 989555988 is about 31457.2088399464. The cubic root of 989555988 is about 996.5064721423.

Subtracting from 989555988 its reverse (889555989), we obtain a palindrome (99999999).

The spelling of 989555988 in words is "nine hundred eighty-nine million, five hundred fifty-five thousand, nine hundred eighty-eight".