678436 has 24 divisors (see below), whose sum is σ = 1372896. Its totient is φ = 289920.

The previous prime is 678421. The next prime is 678437. The reversal of 678436 is 634876.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (678437) by changing a digit.

678436 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 7 ways as a sum of consecutive naturals, for example, 295 + ... + 1201.

It is an arithmetic number, because the mean of its divisors is an integer number (57204).

2⁶⁷⁸⁴³⁶ is an apocalyptic number.

It is an amenable number.

678436 is an abundant number, since it is smaller than the sum of its proper divisors (694460).

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

678436 is a wasteful number, since it uses less digits than its factorization.

678436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939 (or 937 counting only the distinct ones).

The product of its digits is 24192, while the sum is 34.

The square root of 678436 is about 823.6722649209. The cubic root of 678436 is about 87.8691236349.

The spelling of 678436 in words is "six hundred seventy-eight thousand, four hundred thirty-six".