989878660 has 24 divisors (see below), whose sum is σ = 2079667800. Its totient is φ = 395775744.

The previous prime is 989878651. The next prime is 989878661. The reversal of 989878660 is 66878989.

It can be written as a sum of positive squares in 4 ways, for example, as 42224004 + 947654656 = 6498^2 + 30784^2 .

It is not an unprimeable number, because it can be changed into a prime (989878661) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 41272 + ... + 60688.

It is an arithmetic number, because the mean of its divisors is an integer number (86652825).

Almost surely, 2^989878660 is an apocalyptic number.

It is an amenable number.

989878660 is an abundant number, since it is smaller than the sum of its proper divisors (1089789140).

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

989878660 is a wasteful number, since it uses less digits than its factorization.

989878660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21975 (or 21973 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 61.

The square root of 989878660 is about 31462.3371668412. The cubic root of 989878660 is about 996.6147731706.

The spelling of 989878660 in words is "nine hundred eighty-nine million, eight hundred seventy-eight thousand, six hundred sixty".