678445 has 8 divisors (see below), whose sum is σ = 831744. Its totient is φ = 531024.

The previous prime is 678437. The next prime is 678451. The reversal of 678445 is 544876.

678445 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 678445 - 2³ = 678437 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 678445.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1209 + ... + 1678.

It is an arithmetic number, because the mean of its divisors is an integer number (103968).

2⁶⁷⁸⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

678445 is a deficient number, since it is larger than the sum of its proper divisors (153299).

678445 is a wasteful number, since it uses less digits than its factorization.

678445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2939.

The product of its digits is 26880, while the sum is 34.

The square root of 678445 is about 823.6777282408. The cubic root of 678445 is about 87.8695121847.

The spelling of 678445 in words is "six hundred seventy-eight thousand, four hundred forty-five".