782478857 has 2 divisors, whose sum is σ = 782478858. Its totient is φ = 782478856.

The previous prime is 782478847. The next prime is 782478937. The reversal of 782478857 is 758874287.

782478857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 759333136 + 23145721 = 27556^2 + 4811^2 .

It is an emirp because it is prime and its reverse (758874287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 782478857 - 2¹⁰ = 782477833 is a prime.

It is a super-2 number, since 2×782478857² = 1224546323304052898, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (782478847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 391239428 + 391239429.

It is an arithmetic number, because the mean of its divisors is an integer number (391239429).

Almost surely, 2^782478857 is an apocalyptic number.

It is an amenable number.

782478857 is a deficient number, since it is larger than the sum of its proper divisors (1).

782478857 is an equidigital number, since it uses as much as digits as its factorization.

782478857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7024640, while the sum is 56.

The square root of 782478857 is about 27972.8235435753. The cubic root of 782478857 is about 921.4905174684.

The spelling of 782478857 in words is "seven hundred eighty-two million, four hundred seventy-eight thousand, eight hundred fifty-seven".