678440 has 32 divisors (see below), whose sum is σ = 1745280. Its totient is φ = 232512.

The previous prime is 678437. The next prime is 678451. The reversal of 678440 is 44876.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 932 + ... + 1491.

It is an arithmetic number, because the mean of its divisors is an integer number (54540).

2⁶⁷⁸⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

678440 is an abundant number, since it is smaller than the sum of its proper divisors (1066840).

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

678440 is a wasteful number, since it uses less digits than its factorization.

678440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2441 (or 2437 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 678440 is about 823.6746930676. The cubic root of 678440 is about 87.8692963241.

The spelling of 678440 in words is "six hundred seventy-eight thousand, four hundred forty".