678544 has 10 divisors (see below), whose sum is σ = 1314710. Its totient is φ = 339264.

The previous prime is 678541. The next prime is 678553. The reversal of 678544 is 445876.

It can be written as a sum of positive squares in only one way, i.e., 620944 + 57600 = 788^2 + 240^2 .

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 as a sum of consecutive naturals, namely, 21189 + ... + 21220.

It is an arithmetic number, because the mean of its divisors is an integer number (131471).

2⁶⁷⁸⁵⁴⁴ is an apocalyptic number.

It is an amenable number.

678544 is a deficient number, since it is larger than the sum of its proper divisors (636166).

678544 is a wasteful number, since it uses less digits than its factorization.

678544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42417 (or 42411 counting only the distinct ones).

The product of its digits is 26880, while the sum is 34.

The square root of 678544 is about 823.7378223683. The cubic root of 678544 is about 87.8737860063.

The spelling of 678544 in words is "six hundred seventy-eight thousand, five hundred forty-four".