8645978879 has 4 divisors (see below), whose sum is σ = 8648036280. Its totient is φ = 8643921480.

The previous prime is 8645978867. The next prime is 8645978897. The reversal of 8645978879 is 9788795468.

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 8645978879 - 2¹⁶ = 8645913343 is a prime.

It is a super-2 number, since 2×8645978879² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8645978479) 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, 1022384 + ... + 1030805.

It is an arithmetic number, because the mean of its divisors is an integer number (2162009070).

Almost surely, 2^8645978879 is an apocalyptic number.

8645978879 is a deficient number, since it is larger than the sum of its proper divisors (2057401).

8645978879 is a wasteful number, since it uses less digits than its factorization.

8645978879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2057400.

The product of its digits is 243855360, while the sum is 71.

The square root of 8645978879 is about 92983.7559953350. The cubic root of 8645978879 is about 2052.4443481374. Note that the first 3 decimals are identical.

The spelling of 8645978879 in words is "eight billion, six hundred forty-five million, nine hundred seventy-eight thousand, eight hundred seventy-nine".