678071 has 4 divisors (see below), whose sum is σ = 679944. Its totient is φ = 676200.

The previous prime is 678061. The next prime is 678077. The reversal of 678071 is 170876.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678071 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 678071.

It is not an unprimeable number, because it can be changed into a prime (678077) 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 3 ways as a sum of consecutive naturals, for example, 200 + ... + 1181.

It is an arithmetic number, because the mean of its divisors is an integer number (169986).

2⁶⁷⁸⁰⁷¹ is an apocalyptic number.

678071 is a deficient number, since it is larger than the sum of its proper divisors (1873).

678071 is a wasteful number, since it uses less digits than its factorization.

678071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1872.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 678071 is about 823.4506664033. The cubic root of 678071 is about 87.8533628834.

The spelling of 678071 in words is "six hundred seventy-eight thousand, seventy-one".