28906250 has 36 divisors (see below), whose sum is σ = 55664034. Its totient is φ = 11250000.

The previous prime is 28906249. The next prime is 28906259. The reversal of 28906250 is 5260982.

It can be written as a sum of positive squares in 9 ways, for example, as 28826161 + 80089 = 5369^2 + 283^2 .

It is not an unprimeable number, because it can be changed into a prime (28906259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 781232 + ... + 781268.

Almost surely, 2^28906250 is an apocalyptic number.

28906250 is a deficient number, since it is larger than the sum of its proper divisors (26757784).

28906250 is an frugal number, since it uses more digits than its factorization.

28906250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79 (or 44 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 28906250 is about 5376.4532919016. The cubic root of 28906250 is about 306.9002565480.

It can be divided in two parts, 2890 and 6250, that multiplied together give a square (18062500 = 4250²).

The spelling of 28906250 in words is "twenty-eight million, nine hundred six thousand, two hundred fifty".