28904816293 has 4 divisors (see below), whose sum is σ = 28905368128. Its totient is φ = 28904264460.

The previous prime is 28904816263. The next prime is 28904816351. The reversal of 28904816293 is 39261840982.

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 28904816293 - 2⁹ = 28904815781 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28904816293.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28904816233) 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, 188013 + ... + 305218.

It is an arithmetic number, because the mean of its divisors is an integer number (7226342032).

Almost surely, 2^28904816293 is an apocalyptic number.

It is an amenable number.

28904816293 is a deficient number, since it is larger than the sum of its proper divisors (551835).

28904816293 is an equidigital number, since it uses as much as digits as its factorization.

28904816293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551834.

The product of its (nonzero) digits is 1492992, while the sum is 52.

The spelling of 28904816293 in words is "twenty-eight billion, nine hundred four million, eight hundred sixteen thousand, two hundred ninety-three".