780888089 has 2 divisors, whose sum is σ = 780888090. Its totient is φ = 780888088.

The previous prime is 780888079. The next prime is 780888107. The reversal of 780888089 is 980888087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 489161689 + 291726400 = 22117^2 + 17080^2 .

It is an emirp because it is prime and its reverse (980888087) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 780888089 - 2²⁰ = 779839513 is a prime.

It is not a weakly prime, because it can be changed into another prime (780888079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390444044 + 390444045.

It is an arithmetic number, because the mean of its divisors is an integer number (390444045).

Almost surely, 2^780888089 is an apocalyptic number.

It is an amenable number.

780888089 is a deficient number, since it is larger than the sum of its proper divisors (1).

780888089 is an equidigital number, since it uses as much as digits as its factorization.

780888089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2064384, while the sum is 56.

The square root of 780888089 is about 27944.3749080204. The cubic root of 780888089 is about 920.8656349313.

The spelling of 780888089 in words is "seven hundred eighty million, eight hundred eighty-eight thousand, eighty-nine".