678726 has 16 divisors (see below), whose sum is σ = 1508400. Its totient is φ = 226224.

The previous prime is 678721. The next prime is 678731. The reversal of 678726 is 627876.

678726 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (678721) and next prime (678731).

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678721) by changing a digit.

678726 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6231 + ... + 6338.

It is an arithmetic number, because the mean of its divisors is an integer number (94275).

2⁶⁷⁸⁷²⁶ is an apocalyptic number.

678726 is an abundant number, since it is smaller than the sum of its proper divisors (829674).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

678726 is a wasteful number, since it uses less digits than its factorization.

678726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12580 (or 12574 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 678726 is about 823.8482870043. The cubic root of 678726 is about 87.8816418463.

The spelling of 678726 in words is "six hundred seventy-eight thousand, seven hundred twenty-six".