678697 has 4 divisors (see below), whose sum is σ = 681156. Its totient is φ = 676240.

The previous prime is 678659. The next prime is 678719. The reversal of 678697 is 796876.

678697 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 346921 + 331776 = 589^2 + 576^2 .

It is a cyclic number.

It is not a de Polignac number, because 678697 - 2¹¹ = 676649 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 754 + ... + 1387.

It is an arithmetic number, because the mean of its divisors is an integer number (170289).

2⁶⁷⁸⁶⁹⁷ is an apocalyptic number.

It is an amenable number.

678697 is a deficient number, since it is larger than the sum of its proper divisors (2459).

678697 is a wasteful number, since it uses less digits than its factorization.

678697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2458.

The product of its digits is 127008, while the sum is 43.

The square root of 678697 is about 823.8306864884. The cubic root of 678697 is about 87.8803901857.

It can be divided in two parts, 67869 and 7, that added together give a palindrome (67876).

The spelling of 678697 in words is "six hundred seventy-eight thousand, six hundred ninety-seven".