989878770 has 96 divisors (see below), whose sum is σ = 2633117760. Its totient is φ = 257938560.

The previous prime is 989878751. The next prime is 989878783. The reversal of 989878770 is 77878989.

It is a junction number, because it is equal to n+sod(n) for n = 989878698 and 989878707.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 837580 + ... + 838760.

It is an arithmetic number, because the mean of its divisors is an integer number (27428310).

Almost surely, 2^989878770 is an apocalyptic number.

989878770 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 989878770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1316558880).

989878770 is an abundant number, since it is smaller than the sum of its proper divisors (1643238990).

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

989878770 is a wasteful number, since it uses less digits than its factorization.

989878770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1400 (or 1397 counting only the distinct ones).

The product of its (nonzero) digits is 14224896, while the sum is 63.

The square root of 989878770 is about 31462.3389149631. The cubic root of 989878770 is about 996.6148100868.

The spelling of 989878770 in words is "nine hundred eighty-nine million, eight hundred seventy-eight thousand, seven hundred seventy".