66609238 has 8 divisors (see below), whose sum is σ = 100085832. Its totient is φ = 33247296.

The previous prime is 66609233. The next prime is 66609239. The reversal of 66609238 is 83290666.

66609238 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a self number, because there is not a number n which added to its sum of digits gives 66609238.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66609233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27195 + ... + 29542.

It is an arithmetic number, because the mean of its divisors is an integer number (12510729).

Almost surely, 2^66609238 is an apocalyptic number.

66609238 is a deficient number, since it is larger than the sum of its proper divisors (33476594).

66609238 is a wasteful number, since it uses less digits than its factorization.

66609238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57326.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 66609238 is about 8161.4482783388. The cubic root of 66609238 is about 405.3636686729.

The spelling of 66609238 in words is "sixty-six million, six hundred nine thousand, two hundred thirty-eight".