678842 has 8 divisors (see below), whose sum is σ = 1026432. Its totient is φ = 336700.

The previous prime is 678833. The next prime is 678859. The reversal of 678842 is 248876.

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

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 678842.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1034 + ... + 1557.

It is an arithmetic number, because the mean of its divisors is an integer number (128304).

2⁶⁷⁸⁸⁴² is an apocalyptic number.

678842 is a deficient number, since it is larger than the sum of its proper divisors (347590).

678842 is a wasteful number, since it uses less digits than its factorization.

678842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2724.

The product of its digits is 21504, while the sum is 35.

The square root of 678842 is about 823.9186853082. The cubic root of 678842 is about 87.8866481325.

The spelling of 678842 in words is "six hundred seventy-eight thousand, eight hundred forty-two".