28125250 has 16 divisors (see below), whose sum is σ = 52650936. Its totient is φ = 11250000.

The previous prime is 28125239. The next prime is 28125287. The reversal of 28125250 is 5252182.

It can be written as a sum of positive squares in 4 ways, for example, as 2954961 + 25170289 = 1719^2 + 5017^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56001 + ... + 56500.

Almost surely, 2^28125250 is an apocalyptic number.

28125250 is a deficient number, since it is larger than the sum of its proper divisors (24525686).

28125250 is a wasteful number, since it uses less digits than its factorization.

28125250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112518 (or 112508 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 28125250 is about 5303.3244290728. The cubic root of 28125250 is about 304.1110008430. Note that the first 3 decimals are identical.

The spelling of 28125250 in words is "twenty-eight million, one hundred twenty-five thousand, two hundred fifty".