678945 has 8 divisors (see below), whose sum is σ = 1086336. Its totient is φ = 362096.

The previous prime is 678943. The next prime is 678949. The reversal of 678945 is 549876.

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 678945 - 2¹ = 678943 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (678941) 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, 22617 + ... + 22646.

It is an arithmetic number, because the mean of its divisors is an integer number (135792).

2⁶⁷⁸⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

678945 is a deficient number, since it is larger than the sum of its proper divisors (407391).

678945 is a wasteful number, since it uses less digits than its factorization.

678945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45271.

The product of its digits is 60480, while the sum is 39.

The square root of 678945 is about 823.9811891057. The cubic root of 678945 is about 87.8910928913.

The spelling of 678945 in words is "six hundred seventy-eight thousand, nine hundred forty-five".