66040280 has 16 divisors (see below), whose sum is σ = 148590720. Its totient is φ = 26416096.

The previous prime is 66040243. The next prime is 66040297. The reversal of 66040280 is 8204066.

It is a super-2 number, since 2×66040280² = 8722637164956800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 825464 + ... + 825543.

It is an arithmetic number, because the mean of its divisors is an integer number (9286920).

Almost surely, 2^66040280 is an apocalyptic number.

It is an amenable number.

66040280 is an abundant number, since it is smaller than the sum of its proper divisors (82550440).

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

66040280 is a wasteful number, since it uses less digits than its factorization.

66040280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1651018 (or 1651014 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 66040280 is about 8126.5170891348. The cubic root of 66040280 is about 404.2061980440.

The spelling of 66040280 in words is "sixty-six million, forty thousand, two hundred eighty".