66069388 has 36 divisors (see below), whose sum is σ = 145250896. Its totient is φ = 25740000.

The previous prime is 66069379. The next prime is 66069389. The reversal of 66069388 is 88396066.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66069389) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6363 + ... + 13138.

Almost surely, 2^66069388 is an apocalyptic number.

It is an amenable number.

66069388 is an abundant number, since it is smaller than the sum of its proper divisors (79181508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66069388 is a wasteful number, since it uses less digits than its factorization.

66069388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19534 (or 19521 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 66069388 is about 8128.3078189744. The cubic root of 66069388 is about 404.2655754716.

The spelling of 66069388 in words is "sixty-six million, sixty-nine thousand, three hundred eighty-eight".