66508228 has 6 divisors (see below), whose sum is σ = 116389406. Its totient is φ = 33254112.

The previous prime is 66508213. The next prime is 66508231. The reversal of 66508228 is 82280566.

It can be written as a sum of positive squares in only one way, i.e., 41886784 + 24621444 = 6472^2 + 4962^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8313525 + ... + 8313532.

Almost surely, 2^66508228 is an apocalyptic number.

It is an amenable number.

66508228 is a deficient number, since it is larger than the sum of its proper divisors (49881178).

66508228 is a wasteful number, since it uses less digits than its factorization.

66508228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16627061 (or 16627059 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 66508228 is about 8155.2576905945. The cubic root of 66508228 is about 405.1586595762.

It can be divided in two parts, 6650 and 8228, that added together give a triangular number (14878 = T₁₇₂).

The spelling of 66508228 in words is "sixty-six million, five hundred eight thousand, two hundred twenty-eight".