668850 has 96 divisors (see below), whose sum is σ = 2083200. Its totient is φ = 141120.

The previous prime is 668821. The next prime is 668851. The reversal of 668850 is 58866.

668850 = T₆₂ + T₆₃ + ... + T₁₆₁.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668851) by changing a digit.

668850 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 51444 + ... + 51456.

It is an arithmetic number, because the mean of its divisors is an integer number (21700).

2⁶⁶⁸⁸⁵⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1041600).

668850 is an abundant number, since it is smaller than the sum of its proper divisors (1414350).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668850 is a wasteful number, since it uses less digits than its factorization.

668850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49 (or 30 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 668850 is about 817.8325011884. The cubic root of 668850 is about 87.4533084223.

The spelling of 668850 in words is "six hundred sixty-eight thousand, eight hundred fifty".