66040880 has 40 divisors (see below), whose sum is σ = 154140432. Its totient is φ = 26313984.

The previous prime is 66040853. The next prime is 66040957. The reversal of 66040880 is 8804066.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×66040880² = 8722795662348800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21182 + ... + 24098.

Almost surely, 2^66040880 is an apocalyptic number.

It is an amenable number.

66040880 is an abundant number, since it is smaller than the sum of its proper divisors (88099552).

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

66040880 is a wasteful number, since it uses less digits than its factorization.

66040880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3213 (or 3207 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 66040880 is about 8126.5540052349. The cubic root of 66040880 is about 404.2074221605.

The spelling of 66040880 in words is "sixty-six million, forty thousand, eight hundred eighty".