66646028 has 12 divisors (see below), whose sum is σ = 119782992. Its totient is φ = 32422320.

The previous prime is 66646009. The next prime is 66646049. The reversal of 66646028 is 82064666.

66646028 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 66645982 and 66646000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225008 + ... + 225303.

It is an arithmetic number, because the mean of its divisors is an integer number (9981916).

Almost surely, 2^66646028 is an apocalyptic number.

It is an amenable number.

66646028 is a deficient number, since it is larger than the sum of its proper divisors (53136964).

66646028 is a wasteful number, since it uses less digits than its factorization.

66646028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450352 (or 450350 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 66646028 is about 8163.7018563884. The cubic root of 66646028 is about 405.4382858731.

The spelling of 66646028 in words is "sixty-six million, six hundred forty-six thousand, twenty-eight".