28137449 has 2 divisors, whose sum is σ = 28137450. Its totient is φ = 28137448.

The previous prime is 28137433. The next prime is 28137451. The reversal of 28137449 is 94473182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20475625 + 7661824 = 4525^2 + 2768^2 .

It is a cyclic number.

It is not a de Polignac number, because 28137449 - 2⁴ = 28137433 is a prime.

Together with 28137451, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28137419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14068724 + 14068725.

It is an arithmetic number, because the mean of its divisors is an integer number (14068725).

Almost surely, 2^28137449 is an apocalyptic number.

It is an amenable number.

28137449 is a deficient number, since it is larger than the sum of its proper divisors (1).

28137449 is an equidigital number, since it uses as much as digits as its factorization.

28137449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 38.

The square root of 28137449 is about 5304.4744320243. The cubic root of 28137449 is about 304.1549626905.

The spelling of 28137449 in words is "twenty-eight million, one hundred thirty-seven thousand, four hundred forty-nine".