8636989979 has 4 divisors (see below), whose sum is σ = 8647666920. Its totient is φ = 8626313040.

The previous prime is 8636989943. The next prime is 8636989987. The reversal of 8636989979 is 9799896368.

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

It is a cyclic number.

It is not a de Polignac number, because 8636989979 - 2¹² = 8636985883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8636989579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5337257 + ... + 5338874.

It is an arithmetic number, because the mean of its divisors is an integer number (2161916730).

Almost surely, 2^8636989979 is an apocalyptic number.

8636989979 is a deficient number, since it is larger than the sum of its proper divisors (10676941).

8636989979 is a wasteful number, since it uses less digits than its factorization.

8636989979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10676940.

The product of its digits is 317447424, while the sum is 74.

The square root of 8636989979 is about 92935.4075635331. The cubic root of 8636989979 is about 2051.7328183574.

The spelling of 8636989979 in words is "eight billion, six hundred thirty-six million, nine hundred eighty-nine thousand, nine hundred seventy-nine".