678712 has 16 divisors (see below), whose sum is σ = 1302840. Its totient is φ = 331296.

The previous prime is 678659. The next prime is 678719. The reversal of 678712 is 217876.

It is a happy number.

678712 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678719) 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, 643 + ... + 1330.

2⁶⁷⁸⁷¹² is an apocalyptic number.

It is an amenable number.

678712 is a deficient number, since it is larger than the sum of its proper divisors (624128).

678712 is a wasteful number, since it uses less digits than its factorization.

678712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2022 (or 2018 counting only the distinct ones).

The product of its digits is 4704, while the sum is 31.

The square root of 678712 is about 823.8397902505. The cubic root of 678712 is about 87.8810376008.

The spelling of 678712 in words is "six hundred seventy-eight thousand, seven hundred twelve".