8712978569 has 4 divisors (see below), whose sum is σ = 8713196544. Its totient is φ = 8712760596.

The previous prime is 8712978563. The next prime is 8712978623. The reversal of 8712978569 is 9658792178.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8712978569 is a prime.

It is a super-2 number, since 2×8712978569² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8712978563) 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, 29897 + ... + 135350.

It is an arithmetic number, because the mean of its divisors is an integer number (2178299136).

Almost surely, 2^8712978569 is an apocalyptic number.

It is an amenable number.

8712978569 is a deficient number, since it is larger than the sum of its proper divisors (217975).

8712978569 is a wasteful number, since it uses less digits than its factorization.

8712978569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217974.

The product of its digits is 15240960, while the sum is 62.

The square root of 8712978569 is about 93343.3370359127. The cubic root of 8712978569 is about 2057.7323342758.

The spelling of 8712978569 in words is "eight billion, seven hundred twelve million, nine hundred seventy-eight thousand, five hundred sixty-nine".