66109828 has 6 divisors (see below), whose sum is σ = 115692206. Its totient is φ = 33054912.

The previous prime is 66109801. The next prime is 66109847. The reversal of 66109828 is 82890166.

It can be written as a sum of positive squares in only one way, i.e., 62694724 + 3415104 = 7918^2 + 1848^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8263725 + ... + 8263732.

Almost surely, 2^66109828 is an apocalyptic number.

It is an amenable number.

66109828 is a deficient number, since it is larger than the sum of its proper divisors (49582378).

66109828 is a wasteful number, since it uses less digits than its factorization.

66109828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16527461 (or 16527459 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 66109828 is about 8130.7950410769. The cubic root of 66109828 is about 404.3480401144.

The spelling of 66109828 in words is "sixty-six million, one hundred nine thousand, eight hundred twenty-eight".