678449 has 4 divisors (see below), whose sum is σ = 683760. Its totient is φ = 673140.

The previous prime is 678437. The next prime is 678451. The reversal of 678449 is 944876.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678449 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (678409) 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, 2459 + ... + 2720.

It is an arithmetic number, because the mean of its divisors is an integer number (170940).

2⁶⁷⁸⁴⁴⁹ is an apocalyptic number.

It is an amenable number.

678449 is a deficient number, since it is larger than the sum of its proper divisors (5311).

678449 is a wasteful number, since it uses less digits than its factorization.

678449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5310.

The product of its digits is 48384, while the sum is 38.

The square root of 678449 is about 823.6801563714. The cubic root of 678449 is about 87.8696848724.

The spelling of 678449 in words is "six hundred seventy-eight thousand, four hundred forty-nine".