28723825 has 24 divisors (see below), whose sum is σ = 39608576. Its totient is φ = 20520000.

The previous prime is 28723823. The next prime is 28723837. The reversal of 28723825 is 52832782.

It is not a de Polignac number, because 28723825 - 2¹ = 28723823 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28723823) 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, 8650 + ... + 11500.

Almost surely, 2^28723825 is an apocalyptic number.

28723825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28723825 is a deficient number, since it is larger than the sum of its proper divisors (10884751).

28723825 is a wasteful number, since it uses less digits than its factorization.

28723825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2905 (or 2900 counting only the distinct ones).

The product of its digits is 53760, while the sum is 37.

The square root of 28723825 is about 5359.4612602388. The cubic root of 28723825 is about 306.2532860955.

The spelling of 28723825 in words is "twenty-eight million, seven hundred twenty-three thousand, eight hundred twenty-five".