989643667 has 16 divisors (see below), whose sum is σ = 1031450112. Its totient is φ = 948800160.

The previous prime is 989643643. The next prime is 989643679. The reversal of 989643667 is 766346989.

It is not a de Polignac number, because 989643667 - 2¹⁵ = 989610899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (989643607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1241313 + ... + 1242109.

It is an arithmetic number, because the mean of its divisors is an integer number (64465632).

Almost surely, 2^989643667 is an apocalyptic number.

989643667 is a deficient number, since it is larger than the sum of its proper divisors (41806445).

989643667 is a wasteful number, since it uses less digits than its factorization.

989643667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338.

The product of its digits is 11757312, while the sum is 58.

The square root of 989643667 is about 31458.6024324031. The cubic root of 989643667 is about 996.5359028875.

The spelling of 989643667 in words is "nine hundred eighty-nine million, six hundred forty-three thousand, six hundred sixty-seven".