66938 has 4 divisors (see below), whose sum is σ = 100410. Its totient is φ = 33468.

The previous prime is 66931. The next prime is 66943. The reversal of 66938 is 83966.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83966 = 2 ⋅41983.

It can be written as a sum of positive squares in only one way, i.e., 61009 + 5929 = 247^2 + 77^2 .

It is a d-powerful number, because it can be written as 6 + 6⁶ + 9² + 3⁹ + 8³ .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16733 + ... + 16736.

2⁶⁶⁹³⁸ is an apocalyptic number.

66938 is a deficient number, since it is larger than the sum of its proper divisors (33472).

66938 is a wasteful number, since it uses less digits than its factorization.

66938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33471.

The product of its digits is 7776, while the sum is 32.

The square root of 66938 is about 258.7237909432. The cubic root of 66938 is about 40.6029489797.

It can be divided in two parts, 669 and 38, that added together give a palindrome (707).

The spelling of 66938 in words is "sixty-six thousand, nine hundred thirty-eight".