678331 has 4 divisors (see below), whose sum is σ = 680152. Its totient is φ = 676512.

The previous prime is 678329. The next prime is 678341. The reversal of 678331 is 133876.

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

It is a cyclic number.

It is not a de Polignac number, because 678331 - 2¹ = 678329 is a prime.

It is a super-2 number, since 2×678331² = 920265891122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 678331.

It is not an unprimeable number, because it can be changed into a prime (678341) 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, 126 + ... + 1171.

It is an arithmetic number, because the mean of its divisors is an integer number (170038).

2⁶⁷⁸³³¹ is an apocalyptic number.

678331 is a deficient number, since it is larger than the sum of its proper divisors (1821).

678331 is a wasteful number, since it uses less digits than its factorization.

678331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1820.

The product of its digits is 3024, while the sum is 28.

The square root of 678331 is about 823.6085235110. The cubic root of 678331 is about 87.8645902994.

The spelling of 678331 in words is "six hundred seventy-eight thousand, three hundred thirty-one".