66394 has 8 divisors (see below), whose sum is σ = 100980. Its totient is φ = 32736.

The previous prime is 66383. The next prime is 66403. The reversal of 66394 is 49366.

It can be written as a sum of positive squares in 2 ways, for example, as 65025 + 1369 = 255^2 + 37^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9 + ... + 364.

2⁶⁶³⁹⁴ is an apocalyptic number.

66394 is a deficient number, since it is larger than the sum of its proper divisors (34586).

66394 is a wasteful number, since it uses less digits than its factorization.

66394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464.

The product of its digits is 3888, while the sum is 28.

The square root of 66394 is about 257.6703320136. The cubic root of 66394 is about 40.4926573083.

Subtracting from 66394 its sum of digits (28), we obtain a palindrome (66366).

It can be divided in two parts, 663 and 94, that added together give a palindrome (757).

The spelling of 66394 in words is "sixty-six thousand, three hundred ninety-four".