28039449 has 16 divisors (see below), whose sum is σ = 38473344. Its totient is φ = 18153600.

The previous prime is 28039439. The next prime is 28039463. The reversal of 28039449 is 94493082.

It is not a de Polignac number, because 28039449 - 2⁹ = 28038937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28039439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37887 + ... + 38619.

It is an arithmetic number, because the mean of its divisors is an integer number (2404584).

Almost surely, 2^28039449 is an apocalyptic number.

It is an amenable number.

28039449 is a deficient number, since it is larger than the sum of its proper divisors (10433895).

28039449 is a wasteful number, since it uses less digits than its factorization.

28039449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1088.

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 28039449 is about 5295.2288902369. The cubic root of 28039449 is about 303.8014378841.

The spelling of 28039449 in words is "twenty-eight million, thirty-nine thousand, four hundred forty-nine".