28490028225 has 12 divisors (see below), whose sum is σ = 47103513456. Its totient is φ = 15194681680.

The previous prime is 28490028199. The next prime is 28490028241. The reversal of 28490028225 is 52282009482.

It is not a de Polignac number, because 28490028225 - 2¹⁷ = 28489897153 is a prime.

It is a super-2 number, since 2×28490028225² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 189933447 + ... + 189933596.

It is an arithmetic number, because the mean of its divisors is an integer number (3925292788).

Almost surely, 2^28490028225 is an apocalyptic number.

28490028225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28490028225 is a deficient number, since it is larger than the sum of its proper divisors (18613485231).

28490028225 is a wasteful number, since it uses less digits than its factorization.

28490028225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379867056 (or 379867051 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 42.

The spelling of 28490028225 in words is "twenty-eight billion, four hundred ninety million, twenty-eight thousand, two hundred twenty-five".