800078689 has 2 divisors, whose sum is σ = 800078690. Its totient is φ = 800078688.

The previous prime is 800078687. The next prime is 800078707. The reversal of 800078689 is 986870008.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 704371600 + 95707089 = 26540^2 + 9783^2 .

It is a cyclic number.

It is not a de Polignac number, because 800078689 - 2¹ = 800078687 is a prime.

Together with 800078687, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (800078681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400039344 + 400039345.

It is an arithmetic number, because the mean of its divisors is an integer number (400039345).

Almost surely, 2^800078689 is an apocalyptic number.

It is an amenable number.

800078689 is a deficient number, since it is larger than the sum of its proper divisors (1).

800078689 is an equidigital number, since it uses as much as digits as its factorization.

800078689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 800078689 is about 28285.6622513951. The cubic root of 800078689 is about 928.3482025567.

The spelling of 800078689 in words is "eight hundred million, seventy-eight thousand, six hundred eighty-nine".