668331 has 20 divisors (see below), whose sum is σ = 1029952. Its totient is φ = 431568.

The previous prime is 668303. The next prime is 668347. The reversal of 668331 is 133866.

668331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 668331 - 2⁷ = 668203 is a prime.

It is a super-2 number, since 2×668331² = 893332651122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 668295 and 668304.

It is not an unprimeable number, because it can be changed into a prime (668531) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2886 + ... + 3108.

2⁶⁶⁸³³¹ is an apocalyptic number.

668331 is a deficient number, since it is larger than the sum of its proper divisors (361621).

668331 is a wasteful number, since it uses less digits than its factorization.

668331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 263 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 668331 is about 817.5151374745. The cubic root of 668331 is about 87.4306825162.

668331 divided by its sum of digits (27) gives a triangular number (24753 = T₂₂₂).

It can be divided in two parts, 668 and 331, that added together give a palindrome (999).

The spelling of 668331 in words is "six hundred sixty-eight thousand, three hundred thirty-one".