678628 has 6 divisors (see below), whose sum is σ = 1187606. Its totient is φ = 339312.

The previous prime is 678611. The next prime is 678631. The reversal of 678628 is 826876.

678628 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 589824 + 88804 = 768^2 + 298^2 .

It is an unprimeable number.

678628 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 as a sum of consecutive naturals, namely, 84825 + ... + 84832.

2⁶⁷⁸⁶²⁸ is an apocalyptic number.

It is an amenable number.

678628 is a deficient number, since it is larger than the sum of its proper divisors (508978).

678628 is a wasteful number, since it uses less digits than its factorization.

678628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169661 (or 169659 counting only the distinct ones).

The product of its digits is 32256, while the sum is 37.

The square root of 678628 is about 823.7888078871. The cubic root of 678628 is about 87.8774119531.

The spelling of 678628 in words is "six hundred seventy-eight thousand, six hundred twenty-eight".