66391088 has 20 divisors (see below), whose sum is σ = 132783168. Its totient is φ = 32124480.

The previous prime is 66391079. The next prime is 66391109. The reversal of 66391088 is 88019366.

It is a happy number.

66391088 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66431 + ... + 67422.

Almost surely, 2^66391088 is an apocalyptic number.

It is an amenable number.

66391088 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.

66391088 is a wasteful number, since it uses less digits than its factorization.

66391088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133892 (or 133886 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 66391088 is about 8148.0726555425. The cubic root of 66391088 is about 404.9206530528.

The spelling of 66391088 in words is "sixty-six million, three hundred ninety-one thousand, eighty-eight".