66608238 has 8 divisors (see below), whose sum is σ = 133216488. Its totient is φ = 22202744.

The previous prime is 66608221. The next prime is 66608239. The reversal of 66608238 is 83280666.

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

66608238 is an admirable number.

It is a super-5 number, since 5×66608238⁵ (a number of 40 digits) contains 55555 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66608196 and 66608205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66608239) 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, 5550681 + ... + 5550692.

It is an arithmetic number, because the mean of its divisors is an integer number (16652061).

Almost surely, 2^66608238 is an apocalyptic number.

66608238 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.

66608238 is a wasteful number, since it uses less digits than its factorization.

66608238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11101378.

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 66608238 is about 8161.3870144725. The cubic root of 66608238 is about 405.3616400969.

The spelling of 66608238 in words is "sixty-six million, six hundred eight thousand, two hundred thirty-eight".