678546 has 48 divisors (see below), whose sum is σ = 1684800. Its totient is φ = 195360.

The previous prime is 678541. The next prime is 678553. The reversal of 678546 is 645876.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 678546.

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 23 ways as a sum of consecutive naturals, for example, 4480 + ... + 4628.

It is an arithmetic number, because the mean of its divisors is an integer number (35100).

2⁶⁷⁸⁵⁴⁶ is an apocalyptic number.

678546 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 678546, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (842400).

678546 is an abundant number, since it is smaller than the sum of its proper divisors (1006254).

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

678546 is a wasteful number, since it uses less digits than its factorization.

678546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191 (or 188 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 678546 is about 823.7390363459. The cubic root of 678546 is about 87.8738723418.

The spelling of 678546 in words is "six hundred seventy-eight thousand, five hundred forty-six".