66908387 has 16 divisors (see below), whose sum is σ = 84268800. Its totient is φ = 51704352.

The previous prime is 66908363. The next prime is 66908407. The reversal of 66908387 is 78380966.

It is not a de Polignac number, because 66908387 - 2⁸ = 66908131 is a prime.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (66908087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4637 + ... + 12462.

It is an arithmetic number, because the mean of its divisors is an integer number (5266800).

Almost surely, 2^66908387 is an apocalyptic number.

66908387 is a deficient number, since it is larger than the sum of its proper divisors (17360413).

66908387 is a wasteful number, since it uses less digits than its factorization.

66908387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17162.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 66908387 is about 8179.7547029236. The cubic root of 66908387 is about 405.9696059009.

The spelling of 66908387 in words is "sixty-six million, nine hundred eight thousand, three hundred eighty-seven".