28281477404225 has 6 divisors (see below), whose sum is σ = 35069031981270. Its totient is φ = 22625181923360.

The previous prime is 28281477404209. The next prime is 28281477404329. The reversal of 28281477404225 is 52240477418282.

It can be written as a sum of positive squares in 3 ways, for example, as 8423188566529 + 19858288837696 = 2902273^2 + 4456264^2 .

It is not a de Polignac number, because 28281477404225 - 2⁴ = 28281477404209 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 565629548060 + ... + 565629548109.

It is an arithmetic number, because the mean of its divisors is an integer number (5844838663545).

Almost surely, 2^{28281477404225} is an apocalyptic number.

28281477404225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28281477404225 is a deficient number, since it is larger than the sum of its proper divisors (6787554577045).

28281477404225 is a wasteful number, since it uses less digits than its factorization.

28281477404225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1131259096179 (or 1131259096174 counting only the distinct ones).

The product of its (nonzero) digits is 16056320, while the sum is 56.

The spelling of 28281477404225 in words is "twenty-eight trillion, two hundred eighty-one billion, four hundred seventy-seven million, four hundred four thousand, two hundred twenty-five".