678434 has 8 divisors (see below), whose sum is σ = 1026048. Its totient is φ = 336420.

The previous prime is 678421. The next prime is 678437. The reversal of 678434 is 434876.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 678434.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1082 + ... + 1589.

It is an arithmetic number, because the mean of its divisors is an integer number (128256).

2⁶⁷⁸⁴³⁴ is an apocalyptic number.

678434 is a deficient number, since it is larger than the sum of its proper divisors (347614).

678434 is a wasteful number, since it uses less digits than its factorization.

678434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2800.

The product of its digits is 16128, while the sum is 32.

The square root of 678434 is about 823.6710508449. The cubic root of 678434 is about 87.8690372900.

The spelling of 678434 in words is "six hundred seventy-eight thousand, four hundred thirty-four".