66287128 has 32 divisors (see below), whose sum is σ = 128318400. Its totient is φ = 32078592.

The previous prime is 66287113. The next prime is 66287129. The reversal of 66287128 is 82178266.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66287129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70276 + ... + 71212.

It is an arithmetic number, because the mean of its divisors is an integer number (4009950).

Almost surely, 2^66287128 is an apocalyptic number.

It is an amenable number.

66287128 is a deficient number, since it is larger than the sum of its proper divisors (62031272).

66287128 is a wasteful number, since it uses less digits than its factorization.

66287128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1219 (or 1215 counting only the distinct ones).

The product of its digits is 64512, while the sum is 40.

The square root of 66287128 is about 8141.6907335025. The cubic root of 66287128 is about 404.7091912256.

The spelling of 66287128 in words is "sixty-six million, two hundred eighty-seven thousand, one hundred twenty-eight".