668607 has 16 divisors (see below), whose sum is σ = 937728. Its totient is φ = 423360.

The previous prime is 668599. The next prime is 668609. The reversal of 668607 is 706866.

It is not a de Polignac number, because 668607 - 2³ = 668599 is a prime.

It is a super-3 number, since 3×668607³ = 896672833498333629, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9123 + ... + 9195.

It is an arithmetic number, because the mean of its divisors is an integer number (58608).

2⁶⁶⁸⁶⁰⁷ is an apocalyptic number.

668607 is a deficient number, since it is larger than the sum of its proper divisors (269121).

668607 is a wasteful number, since it uses less digits than its factorization.

668607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 668607 is about 817.6839242641. The cubic root of 668607 is about 87.4427162476.

It can be divided in two parts, 668 and 607, that added together give a triangular number (1275 = T₅₀).

The spelling of 668607 in words is "six hundred sixty-eight thousand, six hundred seven".