66623228 has 24 divisors (see below), whose sum is σ = 134937600. Its totient is φ = 28190448.

The previous prime is 66623201. The next prime is 66623251. The reversal of 66623228 is 82232666.

It is a happy number.

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, 12848 + ... + 17271.

It is an arithmetic number, because the mean of its divisors is an integer number (5622400).

Almost surely, 2^66623228 is an apocalyptic number.

It is an amenable number.

66623228 is an abundant number, since it is smaller than the sum of its proper divisors (68314372).

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

66623228 is a wasteful number, since it uses less digits than its factorization.

66623228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30209 (or 30207 counting only the distinct ones).

The product of its digits is 41472, while the sum is 35.

The square root of 66623228 is about 8162.3053116139. The cubic root of 66623228 is about 405.3920463219.

The spelling of 66623228 in words is "sixty-six million, six hundred twenty-three thousand, two hundred twenty-eight".