8027644789 has 2 divisors, whose sum is σ = 8027644790. Its totient is φ = 8027644788.

The previous prime is 8027644787. The next prime is 8027644819. The reversal of 8027644789 is 9874467208.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7826940900 + 200703889 = 88470^2 + 14167^2 .

It is a cyclic number.

It is not a de Polignac number, because 8027644789 - 2¹ = 8027644787 is a prime.

Together with 8027644787, 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 (8027644787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4013822394 + 4013822395.

It is an arithmetic number, because the mean of its divisors is an integer number (4013822395).

Almost surely, 2^8027644789 is an apocalyptic number.

It is an amenable number.

8027644789 is a deficient number, since it is larger than the sum of its proper divisors (1).

8027644789 is an equidigital number, since it uses as much as digits as its factorization.

8027644789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5419008, while the sum is 55.

The square root of 8027644789 is about 89597.1248924875. The cubic root of 8027644789 is about 2002.3010839077.

The spelling of 8027644789 in words is "eight billion, twenty-seven million, six hundred forty-four thousand, seven hundred eighty-nine".