28250609 has 4 divisors (see below), whose sum is σ = 28530420. Its totient is φ = 27970800.

The previous prime is 28250597. The next prime is 28250653. The reversal of 28250609 is 90605282.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26368225 + 1882384 = 5135^2 + 1372^2 .

It is a cyclic number.

It is not a de Polignac number, because 28250609 - 2²⁰ = 27202033 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28250659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139754 + ... + 139955.

It is an arithmetic number, because the mean of its divisors is an integer number (7132605).

Almost surely, 2^28250609 is an apocalyptic number.

It is an amenable number.

28250609 is a deficient number, since it is larger than the sum of its proper divisors (279811).

28250609 is a wasteful number, since it uses less digits than its factorization.

28250609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279810.

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

The square root of 28250609 is about 5315.1301959595. The cubic root of 28250609 is about 304.5621559497.

The spelling of 28250609 in words is "twenty-eight million, two hundred fifty thousand, six hundred nine".