28909250 has 16 divisors (see below), whose sum is σ = 54118584. Its totient is φ = 11563600.

The previous prime is 28909249. The next prime is 28909273. The reversal of 28909250 is 5290982.

It can be written as a sum of positive squares in 4 ways, for example, as 12271009 + 16638241 = 3503^2 + 4079^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28909250.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 57569 + ... + 58068.

Almost surely, 2^28909250 is an apocalyptic number.

28909250 is a deficient number, since it is larger than the sum of its proper divisors (25209334).

28909250 is a wasteful number, since it uses less digits than its factorization.

28909250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115654 (or 115644 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 28909250 is about 5376.7322789962. The cubic root of 28909250 is about 306.9108732707.

The spelling of 28909250 in words is "twenty-eight million, nine hundred nine thousand, two hundred fifty".