66771228 has 12 divisors (see below), whose sum is σ = 155799560. Its totient is φ = 22257072.

The previous prime is 66771203. The next prime is 66771251. The reversal of 66771228 is 82217766.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2782123 + ... + 2782146.

Almost surely, 2^66771228 is an apocalyptic number.

It is an amenable number.

66771228 is an abundant number, since it is smaller than the sum of its proper divisors (89028332).

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

66771228 is a wasteful number, since it uses less digits than its factorization.

66771228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5564276 (or 5564274 counting only the distinct ones).

The product of its digits is 56448, while the sum is 39.

The square root of 66771228 is about 8171.3663484144. The cubic root of 66771228 is about 405.6920100229.

The spelling of 66771228 in words is "sixty-six million, seven hundred seventy-one thousand, two hundred twenty-eight".