66427828 has 6 divisors (see below), whose sum is σ = 116248706. Its totient is φ = 33213912.

The previous prime is 66427817. The next prime is 66427843. The reversal of 66427828 is 82872466.

It can be written as a sum of positive squares in only one way, i.e., 52678564 + 13749264 = 7258^2 + 3708^2 .

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 as a sum of consecutive naturals, namely, 8303475 + ... + 8303482.

Almost surely, 2^66427828 is an apocalyptic number.

It is an amenable number.

66427828 is a deficient number, since it is larger than the sum of its proper divisors (49820878).

66427828 is a wasteful number, since it uses less digits than its factorization.

66427828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16606961 (or 16606959 counting only the distinct ones).

The product of its digits is 258048, while the sum is 43.

The square root of 66427828 is about 8150.3268646110. The cubic root of 66427828 is about 404.9953319586.

The spelling of 66427828 in words is "sixty-six million, four hundred twenty-seven thousand, eight hundred twenty-eight".