989147878 has 16 divisors (see below), whose sum is σ = 1521848160. Its totient is φ = 481896000.

The previous prime is 989147849. The next prime is 989147891. The reversal of 989147878 is 878741989.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60703 + ... + 75253.

It is an arithmetic number, because the mean of its divisors is an integer number (95115510).

Almost surely, 2^989147878 is an apocalyptic number.

989147878 is a deficient number, since it is larger than the sum of its proper divisors (532700282).

989147878 is a wasteful number, since it uses less digits than its factorization.

989147878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15423.

The product of its digits is 8128512, while the sum is 61.

The square root of 989147878 is about 31450.7214225684. The cubic root of 989147878 is about 996.3694611387.

It can be divided in two parts, 989147 and 878, that added together give a square (990025 = 995²).

The spelling of 989147878 in words is "nine hundred eighty-nine million, one hundred forty-seven thousand, eight hundred seventy-eight".