989565988 has 24 divisors (see below), whose sum is σ = 1835011584. Its totient is φ = 465321600.

The previous prime is 989565977. The next prime is 989565989. The reversal of 989565988 is 889565989.

It is a super-2 number, since 2×989565988² = 1958481689212832288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (989565989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97933 + ... + 107563.

It is an arithmetic number, because the mean of its divisors is an integer number (76458816).

Almost surely, 2^989565988 is an apocalyptic number.

It is an amenable number.

989565988 is a deficient number, since it is larger than the sum of its proper divisors (845445596).

989565988 is a wasteful number, since it uses less digits than its factorization.

989565988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11163 (or 11161 counting only the distinct ones).

The product of its digits is 55987200, while the sum is 67.

The square root of 989565988 is about 31457.3677856238. The cubic root of 989565988 is about 996.5098288771.

Subtracting from 989565988 its reverse (889565989), we obtain a palindrome (99999999).

The spelling of 989565988 in words is "nine hundred eighty-nine million, five hundred sixty-five thousand, nine hundred eighty-eight".