28347449 has 32 divisors (see below), whose sum is σ = 35038080. Its totient is φ = 22643712.

The previous prime is 28347443. The next prime is 28347463. The reversal of 28347449 is 94474382.

It is a de Polignac number, because none of the positive numbers 2^k-28347449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28347443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 180479 + ... + 180635.

It is an arithmetic number, because the mean of its divisors is an integer number (1094940).

Almost surely, 2^28347449 is an apocalyptic number.

It is an amenable number.

28347449 is a deficient number, since it is larger than the sum of its proper divisors (6690631).

28347449 is a wasteful number, since it uses less digits than its factorization.

28347449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249.

The product of its digits is 193536, while the sum is 41.

The square root of 28347449 is about 5324.2322451223. The cubic root of 28347449 is about 304.9097609955.

The spelling of 28347449 in words is "twenty-eight million, three hundred forty-seven thousand, four hundred forty-nine".