678545 has 8 divisors (see below), whose sum is σ = 930624. Its totient is φ = 465264.

The previous prime is 678541. The next prime is 678553. The reversal of 678545 is 545876.

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 678545 - 2² = 678541 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 19387 = 678545 / (6 + 7 + 8 + 5 + 4 + 5).

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

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (678541) 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, 9659 + ... + 9728.

It is an arithmetic number, because the mean of its divisors is an integer number (116328).

2⁶⁷⁸⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

678545 is a deficient number, since it is larger than the sum of its proper divisors (252079).

678545 is a wasteful number, since it uses less digits than its factorization.

678545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19399.

The product of its digits is 33600, while the sum is 35.

The square root of 678545 is about 823.7384293573. The cubic root of 678545 is about 87.8738291741.

The spelling of 678545 in words is "six hundred seventy-eight thousand, five hundred forty-five".