678450 has 24 divisors (see below), whose sum is σ = 1682928. Its totient is φ = 180880.

The previous prime is 678437. The next prime is 678451. The reversal of 678450 is 54876.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (678451) by changing a digit.

678450 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 11 ways as a sum of consecutive naturals, for example, 2112 + ... + 2411.

It is an arithmetic number, because the mean of its divisors is an integer number (70122).

2⁶⁷⁸⁴⁵⁰ is an apocalyptic number.

678450 is an abundant number, since it is smaller than the sum of its proper divisors (1004478).

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

678450 is a wasteful number, since it uses less digits than its factorization.

678450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4538 (or 4533 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 678450 is about 823.6807634029. The cubic root of 678450 is about 87.8697280443.

It can be divided in two parts, 678 and 450, that added together give a triangular number (1128 = T₄₇).

The spelling of 678450 in words is "six hundred seventy-eight thousand, four hundred fifty".