28209049 has 4 divisors (see below), whose sum is σ = 30773520. Its totient is φ = 25644580.

The previous prime is 28209047. The next prime is 28209061. The reversal of 28209049 is 94090282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28209049 - 2¹ = 28209047 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28209043) 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, 1282219 + ... + 1282240.

It is an arithmetic number, because the mean of its divisors is an integer number (7693380).

Almost surely, 2^28209049 is an apocalyptic number.

It is an amenable number.

28209049 is a deficient number, since it is larger than the sum of its proper divisors (2564471).

28209049 is a wasteful number, since it uses less digits than its factorization.

28209049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2564470.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 28209049 is about 5311.2191632430. The cubic root of 28209049 is about 304.4127336225.

The spelling of 28209049 in words is "twenty-eight million, two hundred nine thousand, forty-nine".