68644 has 9 divisors (see below), whose sum is σ = 121051. Its totient is φ = 34060.

The previous prime is 68639. The next prime is 68659. The reversal of 68644 is 44686.

68644 = T₂₆₁ + T₂₆₂.

The square root of 68644 is 262.

It is a perfect power (a square), and thus also a powerful number.

68644 is nontrivially palindromic in base 3.

It is a d-powerful number, because it can be written as 6⁴ + 8³ + 6⁴ + 4 + 4⁸ .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 459 + ... + 589.

68644 is a Friedman number, since it can be written as (6+4^4)^(8-6), using all its digits and the basic arithmetic operations.

2⁶⁸⁶⁴⁴ is an apocalyptic number.

68644 is the 262-nd square number.

It is an amenable number.

68644 is a deficient number, since it is larger than the sum of its proper divisors (52407).

68644 is a wasteful number, since it uses less digits than its factorization.

68644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266 (or 133 counting only the distinct ones).

The product of its digits is 4608, while the sum is 28.

The cubic root of 68644 is about 40.9449986264.

The spelling of 68644 in words is "sixty-eight thousand, six hundred forty-four".