8899779989 has 4 divisors (see below), whose sum is σ = 8908265100. Its totient is φ = 8891294880.

The previous prime is 8899779953. The next prime is 8899779991. The reversal of 8899779989 is 9899779988.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5752008964 + 3147771025 = 75842^2 + 56105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8899779989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8899779389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4240982 + ... + 4243079.

It is an arithmetic number, because the mean of its divisors is an integer number (2227066275).

Almost surely, 2^8899779989 is an apocalyptic number.

It is an amenable number.

8899779989 is a deficient number, since it is larger than the sum of its proper divisors (8485111).

8899779989 is a wasteful number, since it uses less digits than its factorization.

8899779989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8485110.

The product of its digits is 1481421312, while the sum is 83.

The square root of 8899779989 is about 94338.6452573917. The cubic root of 8899779989 is about 2072.3340215127.

Subtracting 8899779989 from its reverse (9899779988), we obtain a palindrome (999999999).

The spelling of 8899779989 in words is "eight billion, eight hundred ninety-nine million, seven hundred seventy-nine thousand, nine hundred eighty-nine".