66570228 has 24 divisors (see below), whose sum is σ = 172589760. Its totient is φ = 22190040.

The previous prime is 66570223. The next prime is 66570241. The reversal of 66570228 is 82207566.

66570228 is a `hidden beast` number, since 66 + 570 + 2 + 28 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 66570192 and 66570201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66570223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 308088 + ... + 308303.

It is an arithmetic number, because the mean of its divisors is an integer number (7191240).

Almost surely, 2^66570228 is an apocalyptic number.

It is an amenable number.

66570228 is an abundant number, since it is smaller than the sum of its proper divisors (106019532).

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

66570228 is a wasteful number, since it uses less digits than its factorization.

66570228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616404 (or 616396 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 66570228 is about 8159.0580338664. The cubic root of 66570228 is about 405.2845188671.

The spelling of 66570228 in words is "sixty-six million, five hundred seventy thousand, two hundred twenty-eight".