668650 has 24 divisors (see below), whose sum is σ = 1276704. Its totient is φ = 260400.

The previous prime is 668623. The next prime is 668671. The reversal of 668650 is 56866.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1995 + ... + 2305.

It is an arithmetic number, because the mean of its divisors is an integer number (53196).

668650 is a Friedman number, since it can be written as 86*(6^5-6^0), using all its digits and the basic arithmetic operations.

2⁶⁶⁸⁶⁵⁰ is an apocalyptic number.

668650 is a deficient number, since it is larger than the sum of its proper divisors (608054).

668650 is a wasteful number, since it uses less digits than its factorization.

668650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366 (or 361 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 668650 is about 817.7102176199. The cubic root of 668650 is about 87.4445907699. Note that the first 3 decimals are identical.

The spelling of 668650 in words is "six hundred sixty-eight thousand, six hundred fifty".