66227828 has 6 divisors (see below), whose sum is σ = 115898706. Its totient is φ = 33113912.

The previous prime is 66227807. The next prime is 66227839. The reversal of 66227828 is 82872266.

It can be written as a sum of positive squares in only one way, i.e., 66227044 + 784 = 8138^2 + 28^2 .

It is a super-2 number, since 2×66227828² = 8772250403195168, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8278475 + ... + 8278482.

It is an arithmetic number, because the mean of its divisors is an integer number (19316451).

Almost surely, 2^66227828 is an apocalyptic number.

It is an amenable number.

66227828 is a deficient number, since it is larger than the sum of its proper divisors (49670878).

66227828 is a wasteful number, since it uses less digits than its factorization.

66227828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16556961 (or 16556959 counting only the distinct ones).

The product of its digits is 129024, while the sum is 41.

The square root of 66227828 is about 8138.0481689408. The cubic root of 66227828 is about 404.5884718852.

The spelling of 66227828 in words is "sixty-six million, two hundred twenty-seven thousand, eight hundred twenty-eight".