989892728 has 64 divisors (see below), whose sum is σ = 2217909600. Its totient is φ = 408862720.

The previous prime is 989892719. The next prime is 989892749. The reversal of 989892728 is 827298989.

It is a super-2 number, since 2×989892728² = 1959775225894563968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31976 + ... + 54792.

Almost surely, 2^989892728 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 989892728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1108954800).

989892728 is an abundant number, since it is smaller than the sum of its proper divisors (1228016872).

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

989892728 is a wasteful number, since it uses less digits than its factorization.

989892728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22880 (or 22876 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 62.

The square root of 989892728 is about 31462.5607349434. The cubic root of 989892728 is about 996.6194943924.

The spelling of 989892728 in words is "nine hundred eighty-nine million, eight hundred ninety-two thousand, seven hundred twenty-eight".