28525449 has 4 divisors (see below), whose sum is σ = 38033936. Its totient is φ = 19016964.

The previous prime is 28525429. The next prime is 28525493. The reversal of 28525449 is 94452582.

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 not a de Polignac number, because 28525449 - 2⁵ = 28525417 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 (28525429) 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, 4754239 + ... + 4754244.

It is an arithmetic number, because the mean of its divisors is an integer number (9508484).

Almost surely, 2^28525449 is an apocalyptic number.

It is an amenable number.

28525449 is a deficient number, since it is larger than the sum of its proper divisors (9508487).

28525449 is an equidigital number, since it uses as much as digits as its factorization.

28525449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9508486.

The product of its digits is 115200, while the sum is 39.

The square root of 28525449 is about 5340.9221113961. The cubic root of 28525449 is about 305.5466287983.

The spelling of 28525449 in words is "twenty-eight million, five hundred twenty-five thousand, four hundred forty-nine".