66868 has 12 divisors (see below), whose sum is σ = 119140. Its totient is φ = 32832.

The previous prime is 66863. The next prime is 66877. The reversal of 66868 is 86866.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 51984 + 14884 = 228^2 + 122^2 .

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66863) by changing a digit.

66868 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 3 ways as a sum of consecutive naturals, for example, 178 + ... + 406.

2⁶⁶⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

66868 is a deficient number, since it is larger than the sum of its proper divisors (52272).

66868 is a wasteful number, since it uses less digits than its factorization.

66868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306 (or 304 counting only the distinct ones).

The product of its digits is 13824, while the sum is 34.

The square root of 66868 is about 258.5884761547. The cubic root of 66868 is about 40.5887906156.

The spelling of 66868 in words is "sixty-six thousand, eight hundred sixty-eight".