28005825 has 24 divisors (see below), whose sum is σ = 47095200. Its totient is φ = 14680960.

The previous prime is 28005823. The next prime is 28005839. The reversal of 28005825 is 52850082.

It is not a de Polignac number, because 28005825 - 2¹ = 28005823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28005792 and 28005801.

It is not an unprimeable number, because it can be changed into a prime (28005821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1261 + ... + 7589.

It is an arithmetic number, because the mean of its divisors is an integer number (1962300).

Almost surely, 2^28005825 is an apocalyptic number.

28005825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28005825 is a deficient number, since it is larger than the sum of its proper divisors (19089375).

28005825 is a wasteful number, since it uses less digits than its factorization.

28005825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6401 (or 6396 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 30.

The square root of 28005825 is about 5292.0530042697. The cubic root of 28005825 is about 303.6799530260.

The spelling of 28005825 in words is "twenty-eight million, five thousand, eight hundred twenty-five".