678642 has 16 divisors (see below), whose sum is σ = 1428960. Its totient is φ = 214272.

The previous prime is 678641. The next prime is 678647. The reversal of 678642 is 246876.

It is not an unprimeable number, because it can be changed into a prime (678641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2863 + ... + 3090.

It is an arithmetic number, because the mean of its divisors is an integer number (89310).

2⁶⁷⁸⁶⁴² is an apocalyptic number.

678642 is an abundant number, since it is smaller than the sum of its proper divisors (750318).

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

678642 is a wasteful number, since it uses less digits than its factorization.

678642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5977.

The product of its digits is 16128, while the sum is 33.

The square root of 678642 is about 823.7973051668. The cubic root of 678642 is about 87.8780162485.

The spelling of 678642 in words is "six hundred seventy-eight thousand, six hundred forty-two".