66668828 has 12 divisors (see below), whose sum is σ = 116785032. Its totient is φ = 33301680.

The previous prime is 66668827. The next prime is 66668843. The reversal of 66668828 is 82886666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66668827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3275 + ... + 12002.

It is an arithmetic number, because the mean of its divisors is an integer number (9732086).

Almost surely, 2^66668828 is an apocalyptic number.

It is an amenable number.

66668828 is a deficient number, since it is larger than the sum of its proper divisors (50116204).

66668828 is a wasteful number, since it uses less digits than its factorization.

66668828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16372 (or 16370 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 50.

The square root of 66668828 is about 8165.0981623003. The cubic root of 66668828 is about 405.4845148795.

The spelling of 66668828 in words is "sixty-six million, six hundred sixty-eight thousand, eight hundred twenty-eight".