678566 has 16 divisors (see below), whose sum is σ = 1224960. Its totient is φ = 275400.

The previous prime is 678563. The next prime is 678577. The reversal of 678566 is 665876.

678566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1010 + ... + 1541.

It is an arithmetic number, because the mean of its divisors is an integer number (76560).

2⁶⁷⁸⁵⁶⁶ is an apocalyptic number.

678566 is a deficient number, since it is larger than the sum of its proper divisors (546394).

678566 is a wasteful number, since it uses less digits than its factorization.

678566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2579.

The product of its digits is 60480, while the sum is 38.

The square root of 678566 is about 823.7511760234. The cubic root of 678566 is about 87.8747356880.

The spelling of 678566 in words is "six hundred seventy-eight thousand, five hundred sixty-six".