66828065 has 8 divisors (see below), whose sum is σ = 80237760. Its totient is φ = 53433072.

The previous prime is 66828059. The next prime is 66828079. The reversal of 66828065 is 56082866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66828065 - 2⁴ = 66828049 is a prime.

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, 14582 + ... + 18608.

It is an arithmetic number, because the mean of its divisors is an integer number (10029720).

Almost surely, 2^66828065 is an apocalyptic number.

It is an amenable number.

66828065 is a deficient number, since it is larger than the sum of its proper divisors (13409695).

66828065 is a wasteful number, since it uses less digits than its factorization.

66828065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7351.

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 66828065 is about 8174.8434235770. The cubic root of 66828065 is about 405.8070884181.

The spelling of 66828065 in words is "sixty-six million, eight hundred twenty-eight thousand, sixty-five".