989576640 has 168 divisors, whose sum is σ = 3665695488. Its totient is φ = 243578880.

The previous prime is 989576611. The next prime is 989576717. The reversal of 989576640 is 46675989.

989576640 is a `hidden beast` number, since 9 + 8 + 9 + 576 + 64 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24225 + ... + 50655.

It is an arithmetic number, because the mean of its divisors is an integer number (21819616).

Almost surely, 2^989576640 is an apocalyptic number.

989576640 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 989576640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1832847744).

989576640 is an abundant number, since it is smaller than the sum of its proper divisors (2676118848).

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

989576640 is a wasteful number, since it uses less digits than its factorization.

989576640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26467 (or 26454 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The square root of 989576640 is about 31457.5370936760. The cubic root of 989576640 is about 996.5134044462.

The spelling of 989576640 in words is "nine hundred eighty-nine million, five hundred seventy-six thousand, six hundred forty".