678653 has 2 divisors, whose sum is σ = 678654. Its totient is φ = 678652.

The previous prime is 678649. The next prime is 678659. The reversal of 678653 is 356876.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 344569 + 334084 = 587^2 + 578^2 .

It is a cyclic number.

It is not a de Polignac number, because 678653 - 2² = 678649 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678659) 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, 339326 + 339327.

It is an arithmetic number, because the mean of its divisors is an integer number (339327).

2⁶⁷⁸⁶⁵³ is an apocalyptic number.

It is an amenable number.

678653 is a deficient number, since it is larger than the sum of its proper divisors (1).

678653 is an equidigital number, since it uses as much as digits as its factorization.

678653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 35.

The square root of 678653 is about 823.8039815393. The cubic root of 678653 is about 87.8784910462.

It can be divided in two parts, 678 and 653, that added together give a palindrome (1331).

The spelling of 678653 in words is "six hundred seventy-eight thousand, six hundred fifty-three".