678447 has 36 divisors (see below), whose sum is σ = 1244880. Its totient is φ = 348480.

The previous prime is 678437. The next prime is 678451. The reversal of 678447 is 744876.

It is a happy number.

It is not a de Polignac number, because 678447 - 2⁶ = 678383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 7579 + ... + 7667.

It is an arithmetic number, because the mean of its divisors is an integer number (34580).

2⁶⁷⁸⁴⁴⁷ is an apocalyptic number.

678447 is a deficient number, since it is larger than the sum of its proper divisors (566433).

678447 is a wasteful number, since it uses less digits than its factorization.

678447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124 (or 110 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 678447 is about 823.6789423070. The cubic root of 678447 is about 87.8695985287.

The spelling of 678447 in words is "six hundred seventy-eight thousand, four hundred forty-seven".