66871239 has 8 divisors (see below), whose sum is σ = 89709312. Its totient is φ = 44307000.

The previous prime is 66871237. The next prime is 66871267. The reversal of 66871239 is 93217866.

It is a happy number.

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

It is not a de Polignac number, because 66871239 - 2¹ = 66871237 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66871239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66871237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67887 + ... + 68864.

It is an arithmetic number, because the mean of its divisors is an integer number (11213664).

Almost surely, 2^66871239 is an apocalyptic number.

66871239 is a deficient number, since it is larger than the sum of its proper divisors (22838073).

66871239 is a wasteful number, since it uses less digits than its factorization.

66871239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136917.

The product of its digits is 108864, while the sum is 42.

The square root of 66871239 is about 8177.4836594150. The cubic root of 66871239 is about 405.8944596127.

The spelling of 66871239 in words is "sixty-six million, eight hundred seventy-one thousand, two hundred thirty-nine".