989878769 has 12 divisors (see below), whose sum is σ = 1093785840. Its totient is φ = 888437160.

The previous prime is 989878751. The next prime is 989878783. The reversal of 989878769 is 967878989.

It is a de Polignac number, because none of the positive numbers 2^k-989878769 is a prime.

It is a super-2 number, since 2×989878769² = 1959719954633910722, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (989878469) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61442 + ... + 75860.

It is an arithmetic number, because the mean of its divisors is an integer number (91148820).

Almost surely, 2^989878769 is an apocalyptic number.

It is an amenable number.

989878769 is a deficient number, since it is larger than the sum of its proper divisors (103907071).

989878769 is a wasteful number, since it uses less digits than its factorization.

989878769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14588 (or 14509 counting only the distinct ones).

The product of its digits is 109734912, while the sum is 71.

The square root of 989878769 is about 31462.3388990711. The cubic root of 989878769 is about 996.6148097512.

The spelling of 989878769 in words is "nine hundred eighty-nine million, eight hundred seventy-eight thousand, seven hundred sixty-nine".