28943868168 has 24 divisors (see below), whose sum is σ = 78389643150. Its totient is φ = 9647956032.

The previous prime is 28943868157. The next prime is 28943868181. The reversal of 28943868168 is 86186834982.

28943868168 is a `hidden beast` number, since 2 + 8 + 94 + 386 + 8 + 168 = 666.

It can be written as a sum of positive squares in only one way, i.e., 27748230084 + 1195638084 = 166578^2 + 34578^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 200999013 + ... + 200999156.

Almost surely, 2^28943868168 is an apocalyptic number.

It is an amenable number.

28943868168 is an abundant number, since it is smaller than the sum of its proper divisors (49445774982).

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

28943868168 is a wasteful number, since it uses less digits than its factorization.

28943868168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401998181 (or 401998174 counting only the distinct ones).

The product of its digits is 31850496, while the sum is 63.

The spelling of 28943868168 in words is "twenty-eight billion, nine hundred forty-three million, eight hundred sixty-eight thousand, one hundred sixty-eight".