136668 has 24 divisors (see below), whose sum is σ = 364672. Its totient is φ = 39024.

The previous prime is 136657. The next prime is 136691. The reversal of 136668 is 866631.

136668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a plaindrome in base 10.

It is a congruent number.

It is an unprimeable number.

136668 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 7 ways as a sum of consecutive naturals, for example, 730 + ... + 897.

2¹³⁶⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

136668 is an abundant number, since it is smaller than the sum of its proper divisors (228004).

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

136668 is a wasteful number, since it uses less digits than its factorization.

136668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1641 (or 1639 counting only the distinct ones).

The product of its digits is 5184, while the sum is 30.

The square root of 136668 is about 369.6863535485. The cubic root of 136668 is about 51.5096912041.

The spelling of 136668 in words is "one hundred thirty-six thousand, six hundred sixty-eight".