66838 has 8 divisors (see below), whose sum is σ = 104688. Its totient is φ = 31944.

The previous prime is 66821. The next prime is 66841. The reversal of 66838 is 83866.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 681 + ... + 772.

It is an arithmetic number, because the mean of its divisors is an integer number (13086).

2⁶⁶⁸³⁸ is an apocalyptic number.

66838 is a deficient number, since it is larger than the sum of its proper divisors (37850).

66838 is a wasteful number, since it uses less digits than its factorization.

66838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1478.

The product of its digits is 6912, while the sum is 31.

The square root of 66838 is about 258.5304624217. The cubic root of 66838 is about 40.5827197203.

The spelling of 66838 in words is "sixty-six thousand, eight hundred thirty-eight".