678897 has 12 divisors (see below), whose sum is σ = 987844. Its totient is φ = 449280.

The previous prime is 678883. The next prime is 678901. The reversal of 678897 is 798876.

It can be written as a sum of positive squares in 2 ways, for example, as 194481 + 484416 = 441^2 + 696^2 .

It is not a de Polignac number, because 678897 - 2⁶ = 678833 is a prime.

It is a super-2 number, since 2×678897² = 921802273218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (670897) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2013 + ... + 2325.

2⁶⁷⁸⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

678897 is a deficient number, since it is larger than the sum of its proper divisors (308947).

678897 is a wasteful number, since it uses less digits than its factorization.

678897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560 (or 557 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 678897 is about 823.9520617123. The cubic root of 678897 is about 87.8890216033.

Adding to 678897 its product of digits (169344), we get a square (848241 = 921²).

It can be divided in two parts, 67889 and 7, that added together give a triangular number (67896 = T₃₆₈).

The spelling of 678897 in words is "six hundred seventy-eight thousand, eight hundred ninety-seven".