780257 has 2 divisors, whose sum is σ = 780258. Its totient is φ = 780256.

The previous prime is 780253. The next prime is 780287. The reversal of 780257 is 752087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 776161 + 4096 = 881^2 + 64^2 .

It is a cyclic number.

It is not a de Polignac number, because 780257 - 2² = 780253 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (780253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390128 + 390129.

It is an arithmetic number, because the mean of its divisors is an integer number (390129).

2⁷⁸⁰²⁵⁷ is an apocalyptic number.

It is an amenable number.

780257 is a deficient number, since it is larger than the sum of its proper divisors (1).

780257 is an equidigital number, since it uses as much as digits as its factorization.

780257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3920, while the sum is 29.

The square root of 780257 is about 883.3215722487. The cubic root of 780257 is about 92.0617496602.

The spelling of 780257 in words is "seven hundred eighty thousand, two hundred fifty-seven".