866136228 has 12 divisors (see below), whose sum is σ = 2020984560. Its totient is φ = 288712072.

The previous prime is 866136211. The next prime is 866136233. The reversal of 866136228 is 822631668.

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

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 866136228.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36088998 + ... + 36089021.

It is an arithmetic number, because the mean of its divisors is an integer number (168415380).

Almost surely, 2^866136228 is an apocalyptic number.

It is an amenable number.

866136228 is an abundant number, since it is smaller than the sum of its proper divisors (1154848332).

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

866136228 is a wasteful number, since it uses less digits than its factorization.

866136228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72178026 (or 72178024 counting only the distinct ones).

The product of its digits is 165888, while the sum is 42.

The square root of 866136228 is about 29430.1924560476. The cubic root of 866136228 is about 953.2249505402.

The spelling of 866136228 in words is "eight hundred sixty-six million, one hundred thirty-six thousand, two hundred twenty-eight".