678744 has 48 divisors (see below), whose sum is σ = 2007720. Its totient is φ = 205440.

The previous prime is 678739. The next prime is 678749. The reversal of 678744 is 447876.

It is a happy number.

678744 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (678739) and next prime (678749).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 678699 and 678708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678749) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 364 + ... + 1220.

2⁶⁷⁸⁷⁴⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1003860).

678744 is an abundant number, since it is smaller than the sum of its proper divisors (1328976).

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

678744 is a wasteful number, since it uses less digits than its factorization.

678744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880 (or 873 counting only the distinct ones).

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

The square root of 678744 is about 823.8592112734. The cubic root of 678744 is about 87.8824187212.

The spelling of 678744 in words is "six hundred seventy-eight thousand, seven hundred forty-four".