678611 has 2 divisors, whose sum is σ = 678612. Its totient is φ = 678610.

The previous prime is 678607. The next prime is 678631. The reversal of 678611 is 116876.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 678611 - 2² = 678607 is a prime.

It is a Chen prime.

It is an Ulam number.

It is equal to p₅₄₉₄₇ and since 678611 and 54947 have the same sum of digits, it is a Honaker prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 678611.

It is not a weakly prime, because it can be changed into another prime (678631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339305 + 339306.

It is an arithmetic number, because the mean of its divisors is an integer number (339306).

2⁶⁷⁸⁶¹¹ is an apocalyptic number.

678611 is a deficient number, since it is larger than the sum of its proper divisors (1).

678611 is an equidigital number, since it uses as much as digits as its factorization.

678611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 29.

The square root of 678611 is about 823.7784896439. The cubic root of 678611 is about 87.8766781547.

The spelling of 678611 in words is "six hundred seventy-eight thousand, six hundred eleven".