678659 has 2 divisors, whose sum is σ = 678660. Its totient is φ = 678658.

The previous prime is 678653. The next prime is 678719. The reversal of 678659 is 956876.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 678659 - 2¹² = 674563 is a prime.

It is a plaindrome in base 12.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 678659.

It is not a weakly prime, because it can be changed into another prime (678653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339329 + 339330.

It is an arithmetic number, because the mean of its divisors is an integer number (339330).

2⁶⁷⁸⁶⁵⁹ is an apocalyptic number.

678659 is a deficient number, since it is larger than the sum of its proper divisors (1).

678659 is an equidigital number, since it uses as much as digits as its factorization.

678659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 41.

The square root of 678659 is about 823.8076231742. The cubic root of 678659 is about 87.8787500246.

The spelling of 678659 in words is "six hundred seventy-eight thousand, six hundred fifty-nine".