66028028 has 24 divisors (see below), whose sum is σ = 126623280. Its totient is φ = 29877120.

The previous prime is 66028007. The next prime is 66028037. The reversal of 66028028 is 82082066.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 66027985 and 66028003.

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 7 ways as a sum of consecutive naturals, for example, 6800 + ... + 13352.

It is an arithmetic number, because the mean of its divisors is an integer number (5275970).

Almost surely, 2^66028028 is an apocalyptic number.

It is an amenable number.

66028028 is a deficient number, since it is larger than the sum of its proper divisors (60595252).

66028028 is a wasteful number, since it uses less digits than its factorization.

66028028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6797 (or 6795 counting only the distinct ones).

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

The square root of 66028028 is about 8125.7632256915. The cubic root of 66028028 is about 404.1811999639.

The spelling of 66028028 in words is "sixty-six million, twenty-eight thousand, twenty-eight".