28503925 has 6 divisors (see below), whose sum is σ = 35344898. Its totient is φ = 22803120.

The previous prime is 28503913. The next prime is 28503961. The reversal of 28503925 is 52930582.

It can be written as a sum of positive squares in 3 ways, for example, as 6140484 + 22363441 = 2478^2 + 4729^2 .

It is not a de Polignac number, because 28503925 - 2¹⁷ = 28372853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 570054 + ... + 570103.

Almost surely, 2^28503925 is an apocalyptic number.

28503925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28503925 is a deficient number, since it is larger than the sum of its proper divisors (6840973).

28503925 is a wasteful number, since it uses less digits than its factorization.

28503925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1140167 (or 1140162 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 28503925 is about 5338.9067232908. The cubic root of 28503925 is about 305.4697589541.

The spelling of 28503925 in words is "twenty-eight million, five hundred three thousand, nine hundred twenty-five".