28475468891 has 4 divisors (see below), whose sum is σ = 29974177800. Its totient is φ = 26976759984.

The previous prime is 28475468881. The next prime is 28475468963. The reversal of 28475468891 is 19886457482.

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 28475468891 - 2¹⁴ = 28475452507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28475468881) 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, 749354426 + ... + 749354463.

It is an arithmetic number, because the mean of its divisors is an integer number (7493544450).

Almost surely, 2^28475468891 is an apocalyptic number.

28475468891 is a deficient number, since it is larger than the sum of its proper divisors (1498708909).

28475468891 is a wasteful number, since it uses less digits than its factorization.

28475468891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1498708908.

The product of its digits is 30965760, while the sum is 62.

The spelling of 28475468891 in words is "twenty-eight billion, four hundred seventy-five million, four hundred sixty-eight thousand, eight hundred ninety-one".