678485 has 4 divisors (see below), whose sum is σ = 814188. Its totient is φ = 542784.

The previous prime is 678481. The next prime is 678493. The reversal of 678485 is 584876.

678485 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 271441 + 407044 = 521^2 + 638^2 .

It is a cyclic number.

It is not a de Polignac number, because 678485 - 2² = 678481 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678481) 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, 67844 + ... + 67853.

It is an arithmetic number, because the mean of its divisors is an integer number (203547).

2⁶⁷⁸⁴⁸⁵ is an apocalyptic number.

It is an amenable number.

678485 is a deficient number, since it is larger than the sum of its proper divisors (135703).

678485 is a wasteful number, since it uses less digits than its factorization.

678485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135702.

The product of its digits is 53760, while the sum is 38.

The square root of 678485 is about 823.7020092242. The cubic root of 678485 is about 87.8712390314.

The spelling of 678485 in words is "six hundred seventy-eight thousand, four hundred eighty-five".