989525988 has 72 divisors (see below), whose sum is σ = 2748476640. Its totient is φ = 297682560.

The previous prime is 989525981. The next prime is 989525989. The reversal of 989525988 is 889525989.

It is a super-2 number, since 2×989525988² = 1958323361854752288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (989525981) 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, 46056 + ... + 64032.

Almost surely, 2^989525988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 989525988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1374238320).

989525988 is an abundant number, since it is smaller than the sum of its proper divisors (1758950652).

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

989525988 is a wasteful number, since it uses less digits than its factorization.

989525988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18137 (or 18132 counting only the distinct ones).

The product of its digits is 18662400, while the sum is 63.

The square root of 989525988 is about 31456.7319980954. The cubic root of 989525988 is about 996.4964018021.

Subtracting from 989525988 its reverse (889525989), we obtain a palindrome (99999999).

The spelling of 989525988 in words is "nine hundred eighty-nine million, five hundred twenty-five thousand, nine hundred eighty-eight".