28005000025 has 12 divisors (see below), whose sum is σ = 35244503632. Its totient is φ = 22069610640.

The previous prime is 28004999999. The next prime is 28005000029. The reversal of 28005000025 is 52000050082.

It is not a de Polignac number, because 28005000025 - 2⁹ = 28004999513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28005000029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8358027 + ... + 8361376.

Almost surely, 2^28005000025 is an apocalyptic number.

28005000025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28005000025 is a deficient number, since it is larger than the sum of its proper divisors (7239503607).

28005000025 is a wasteful number, since it uses less digits than its factorization.

28005000025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16719480 (or 16719475 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The spelling of 28005000025 in words is "twenty-eight billion, five million, twenty-five", and thus it is an aban number and an uban number.