678931 has 12 divisors (see below), whose sum is σ = 774592. Its totient is φ = 594000.

The previous prime is 678907. The next prime is 678941. The reversal of 678931 is 139876.

It is not a de Polignac number, because 678931 - 2¹¹ = 676883 is a prime.

It is a super-2 number, since 2×678931² = 921894605522, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3661 + ... + 3841.

2⁶⁷⁸⁹³¹ is an apocalyptic number.

678931 is a deficient number, since it is larger than the sum of its proper divisors (95661).

678931 is a wasteful number, since it uses less digits than its factorization.

678931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234 (or 223 counting only the distinct ones).

The product of its digits is 9072, while the sum is 34.

The square root of 678931 is about 823.9726937223. The cubic root of 678931 is about 87.8904887758.

It can be divided in two parts, 67 and 8931, that added together give a palindrome (8998).

The spelling of 678931 in words is "six hundred seventy-eight thousand, nine hundred thirty-one".