780889 has 2 divisors, whose sum is σ = 780890. Its totient is φ = 780888.

The previous prime is 780887. The next prime is 780917. The reversal of 780889 is 988087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 547600 + 233289 = 740^2 + 483^2 .

It is a cyclic number.

It is not a de Polignac number, because 780889 - 2¹ = 780887 is a prime.

Together with 780887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (780887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390444 + 390445.

It is an arithmetic number, because the mean of its divisors is an integer number (390445).

2⁷⁸⁰⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

780889 is a deficient number, since it is larger than the sum of its proper divisors (1).

780889 is an equidigital number, since it uses as much as digits as its factorization.

780889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 780889 is about 883.6792404487. The cubic root of 780889 is about 92.0865993031.

The spelling of 780889 in words is "seven hundred eighty thousand, eight hundred eighty-nine".