66387 has 4 divisors (see below), whose sum is σ = 88520. Its totient is φ = 44256.

The previous prime is 66383. The next prime is 66403. The reversal of 66387 is 78366.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 66387 - 2² = 66383 is a prime.

It is a D-number.

It is a Duffinian number.

66387 is a lucky number.

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

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, 11062 + ... + 11067.

It is an arithmetic number, because the mean of its divisors is an integer number (22130).

2⁶⁶³⁸⁷ is an apocalyptic number.

66387 is a deficient number, since it is larger than the sum of its proper divisors (22133).

66387 is a wasteful number, since it uses less digits than its factorization.

66387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22132.

The product of its digits is 6048, while the sum is 30.

The square root of 66387 is about 257.6567484076. The cubic root of 66387 is about 40.4912341949.

The spelling of 66387 in words is "sixty-six thousand, three hundred eighty-seven".