8778713389 has 2 divisors, whose sum is σ = 8778713390. Its totient is φ = 8778713388.

The previous prime is 8778713387. The next prime is 8778713443. The reversal of 8778713389 is 9833178778.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6089461225 + 2689252164 = 78035^2 + 51858^2 .

It is a cyclic number.

It is not a de Polignac number, because 8778713389 - 2¹ = 8778713387 is a prime.

Together with 8778713387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8778713387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4389356694 + 4389356695.

It is an arithmetic number, because the mean of its divisors is an integer number (4389356695).

Almost surely, 2^8778713389 is an apocalyptic number.

It is an amenable number.

8778713389 is a deficient number, since it is larger than the sum of its proper divisors (1).

8778713389 is an equidigital number, since it uses as much as digits as its factorization.

8778713389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14224896, while the sum is 61.

The square root of 8778713389 is about 93694.7884836718. The cubic root of 8778713389 is about 2062.8942091868.

The spelling of 8778713389 in words is "eight billion, seven hundred seventy-eight million, seven hundred thirteen thousand, three hundred eighty-nine".