28092406221 has 24 divisors (see below), whose sum is σ = 44394446304. Its totient is φ = 16976614560.

The previous prime is 28092406213. The next prime is 28092406231. The reversal of 28092406221 is 12260429082.

28092406221 is a `hidden beast` number, since 2 + 8 + 0 + 9 + 24 + 0 + 622 + 1 = 666.

It is not a de Polignac number, because 28092406221 - 2³ = 28092406213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28092406201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 374526 + ... + 443231.

It is an arithmetic number, because the mean of its divisors is an integer number (1849768596).

Almost surely, 2^28092406221 is an apocalyptic number.

It is an amenable number.

28092406221 is a deficient number, since it is larger than the sum of its proper divisors (16302040083).

28092406221 is a wasteful number, since it uses less digits than its factorization.

28092406221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818121 (or 818118 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The spelling of 28092406221 in words is "twenty-eight billion, ninety-two million, four hundred six thousand, two hundred twenty-one".