28817040821 has 4 divisors (see below), whose sum is σ = 30333727200. Its totient is φ = 27300354444.

The previous prime is 28817040781. The next prime is 28817040823. The reversal of 28817040821 is 12804071882.

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 28817040821 - 2⁶ = 28817040757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28817040823) 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, 758343161 + ... + 758343198.

It is an arithmetic number, because the mean of its divisors is an integer number (7583431800).

Almost surely, 2^28817040821 is an apocalyptic number.

It is an amenable number.

28817040821 is a deficient number, since it is larger than the sum of its proper divisors (1516686379).

28817040821 is a wasteful number, since it uses less digits than its factorization.

28817040821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1516686378.

The product of its (nonzero) digits is 57344, while the sum is 41.

The spelling of 28817040821 in words is "twenty-eight billion, eight hundred seventeen million, forty thousand, eight hundred twenty-one".