678773 has 2 divisors, whose sum is σ = 678774. Its totient is φ = 678772.

The previous prime is 678767. The next prime is 678779. The reversal of 678773 is 377876.

It is a balanced prime because it is at equal distance from previous prime (678767) and next prime (678779).

It can be written as a sum of positive squares in only one way, i.e., 677329 + 1444 = 823^2 + 38^2 .

It is a cyclic number.

It is not a de Polignac number, because 678773 - 2⁴ = 678757 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339386 + 339387.

It is an arithmetic number, because the mean of its divisors is an integer number (339387).

2⁶⁷⁸⁷⁷³ is an apocalyptic number.

It is an amenable number.

678773 is a deficient number, since it is larger than the sum of its proper divisors (1).

678773 is an equidigital number, since it uses as much as digits as its factorization.

678773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49392, while the sum is 38.

The square root of 678773 is about 823.8768111799. The cubic root of 678773 is about 87.8836703241.

The spelling of 678773 in words is "six hundred seventy-eight thousand, seven hundred seventy-three".