28066321471 has 4 divisors (see below), whose sum is σ = 28344205944. Its totient is φ = 27788437000.

The previous prime is 28066321469. The next prime is 28066321477. The reversal of 28066321471 is 17412366082.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28066321471 - 2¹ = 28066321469 is a prime.

It is a super-3 number, since 3×28066321471³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28066321477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138942085 + ... + 138942286.

It is an arithmetic number, because the mean of its divisors is an integer number (7086051486).

Almost surely, 2^28066321471 is an apocalyptic number.

28066321471 is a deficient number, since it is larger than the sum of its proper divisors (277884473).

28066321471 is a wasteful number, since it uses less digits than its factorization.

28066321471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277884472.

The product of its (nonzero) digits is 96768, while the sum is 40.

The spelling of 28066321471 in words is "twenty-eight billion, sixty-six million, three hundred twenty-one thousand, four hundred seventy-one".