66388 has 12 divisors (see below), whose sum is σ = 132832. Its totient is φ = 28440.

The previous prime is 66383. The next prime is 66403. The reversal of 66388 is 88366.

66388 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1158 + ... + 1213.

2⁶⁶³⁸⁸ is an apocalyptic number.

It is an amenable number.

66388 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66416).

66388 is a wasteful number, since it uses less digits than its factorization.

66388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2382 (or 2380 counting only the distinct ones).

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

The square root of 66388 is about 257.6586889666. The cubic root of 66388 is about 40.4914375030.

It can be divided in two parts, 66 and 388, that added together give a palindrome (454).

The spelling of 66388 in words is "sixty-six thousand, three hundred eighty-eight".