28307449 has 2 divisors, whose sum is σ = 28307450. Its totient is φ = 28307448.

The previous prime is 28307441. The next prime is 28307453. The reversal of 28307449 is 94470382.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28015849 + 291600 = 5293^2 + 540^2 .

It is a cyclic number.

It is not a de Polignac number, because 28307449 - 2³ = 28307441 is a prime.

It is not a weakly prime, because it can be changed into another prime (28307441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14153724 + 14153725.

It is an arithmetic number, because the mean of its divisors is an integer number (14153725).

Almost surely, 2^28307449 is an apocalyptic number.

It is an amenable number.

28307449 is a deficient number, since it is larger than the sum of its proper divisors (1).

28307449 is an equidigital number, since it uses as much as digits as its factorization.

28307449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 28307449 is about 5320.4745089137. The cubic root of 28307449 is about 304.7662779898.

The spelling of 28307449 in words is "twenty-eight million, three hundred seven thousand, four hundred forty-nine".