28725249 has 8 divisors (see below), whose sum is σ = 43771840. Its totient is φ = 16414416.

The previous prime is 28725227. The next prime is 28725253. The reversal of 28725249 is 94252782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28725249 - 2⁹ = 28724737 is a prime.

It is a super-2 number, since 2×28725249² = 1650279860224002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28725049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 683914 + ... + 683955.

It is an arithmetic number, because the mean of its divisors is an integer number (5471480).

Almost surely, 2^28725249 is an apocalyptic number.

It is an amenable number.

28725249 is a deficient number, since it is larger than the sum of its proper divisors (15046591).

28725249 is a wasteful number, since it uses less digits than its factorization.

28725249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1367879.

The product of its digits is 80640, while the sum is 39.

The square root of 28725249 is about 5359.5941077660. The cubic root of 28725249 is about 306.2583469056.

The spelling of 28725249 in words is "twenty-eight million, seven hundred twenty-five thousand, two hundred forty-nine".