28863488921 has 4 divisors (see below), whose sum is σ = 29036324352. Its totient is φ = 28690653492.

The previous prime is 28863488887. The next prime is 28863488971. The reversal of 28863488921 is 12988436882.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28863488921 - 2¹⁰ = 28863487897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28863488971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86417465 + ... + 86417798.

It is an arithmetic number, because the mean of its divisors is an integer number (7259081088).

Almost surely, 2^28863488921 is an apocalyptic number.

It is an amenable number.

28863488921 is a deficient number, since it is larger than the sum of its proper divisors (172835431).

28863488921 is a wasteful number, since it uses less digits than its factorization.

28863488921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172835430.

The product of its digits is 10616832, while the sum is 59.

The spelling of 28863488921 in words is "twenty-eight billion, eight hundred sixty-three million, four hundred eighty-eight thousand, nine hundred twenty-one".