678444 has 24 divisors (see below), whose sum is σ = 1705200. Its totient is φ = 208704.

The previous prime is 678437. The next prime is 678451. The reversal of 678444 is 444876.

It is an interprime number because it is at equal distance from previous prime (678437) and next prime (678451).

It is a super-2 number, since 2×678444² = 920572522272, which contains 22 as substring.

It is an unprimeable number.

678444 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2019 + ... + 2330.

It is an arithmetic number, because the mean of its divisors is an integer number (71050).

2⁶⁷⁸⁴⁴⁴ is an apocalyptic number.

It is an amenable number.

678444 is an abundant number, since it is smaller than the sum of its proper divisors (1026756).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

678444 is a wasteful number, since it uses less digits than its factorization.

678444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4369 (or 4367 counting only the distinct ones).

The product of its digits is 21504, while the sum is 33.

The square root of 678444 is about 823.6771212071. The cubic root of 678444 is about 87.8694690127.

The spelling of 678444 in words is "six hundred seventy-eight thousand, four hundred forty-four".