66123228 has 24 divisors (see below), whose sum is σ = 154667520. Its totient is φ = 21986800.

The previous prime is 66123209. The next prime is 66123257. The reversal of 66123228 is 82232166.

It is a super-2 number, since 2×66123228² = 8744562562279968, which contains 22 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 66123195 and 66123204.

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 in 7 ways as a sum of consecutive naturals, for example, 1548 + ... + 11603.

It is an arithmetic number, because the mean of its divisors is an integer number (6444480).

Almost surely, 2^66123228 is an apocalyptic number.

It is an amenable number.

66123228 is an abundant number, since it is smaller than the sum of its proper divisors (88544292).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66123228 is a wasteful number, since it uses less digits than its factorization.

66123228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13577 (or 13575 counting only the distinct ones).

The product of its digits is 6912, while the sum is 30.

The square root of 66123228 is about 8131.6190269835. The cubic root of 66123228 is about 404.3753577759.

The spelling of 66123228 in words is "sixty-six million, one hundred twenty-three thousand, two hundred twenty-eight".