28171033866 has 12 divisors (see below), whose sum is σ = 61037240082. Its totient is φ = 9390344616.

The previous prime is 28171033861. The next prime is 28171033883. The reversal of 28171033866 is 66833017182.

It can be written as a sum of positive squares in only one way, i.e., 26529568641 + 1641465225 = 162879^2 + 40515^2 .

It is not an unprimeable number, because it can be changed into a prime (28171033861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 782528701 + ... + 782528736.

Almost surely, 2^28171033866 is an apocalyptic number.

28171033866 is an abundant number, since it is smaller than the sum of its proper divisors (32866206216).

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

28171033866 is a wasteful number, since it uses less digits than its factorization.

28171033866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565057445 (or 1565057442 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 28171033866 in words is "twenty-eight billion, one hundred seventy-one million, thirty-three thousand, eight hundred sixty-six".