28303449 has 16 divisors (see below), whose sum is σ = 39398400. Its totient is φ = 18050816.

The previous prime is 28303441. The next prime is 28303463. The reversal of 28303449 is 94430382.

It is a cyclic number.

It is not a de Polignac number, because 28303449 - 2³ = 28303441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28303441) 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, 8392 + ... + 11270.

It is an arithmetic number, because the mean of its divisors is an integer number (2462400).

Almost surely, 2^28303449 is an apocalyptic number.

28303449 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28303449 is a deficient number, since it is larger than the sum of its proper divisors (11094951).

28303449 is a wasteful number, since it uses less digits than its factorization.

28303449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3024.

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 28303449 is about 5320.0985893120. The cubic root of 28303449 is about 304.7519222568.

The spelling of 28303449 in words is "twenty-eight million, three hundred three thousand, four hundred forty-nine".