28449907 has 2 divisors, whose sum is σ = 28449908.
Its totient is φ = 28449906.
The previous prime is 28449893. The next prime is 28449931. The reversal of 28449907 is 70994482.
It is a weak prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-28449907 is a prime.
It is not a weakly prime, because it can be changed into another prime (28449307) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14224953 + 14224954.
It is an arithmetic number, because the mean of its divisors is an integer number (14224954).
Almost surely, 228449907 is an apocalyptic number.
28449907 is a deficient number, since it is larger than the sum of its proper divisors (1).
28449907 is an equidigital number, since it uses as much as digits as its factorization.
28449907 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 145152, while the sum is 43.
The square root of 28449907 is about 5333.8454233320.
The cubic root of 28449907 is about 305.2766709254.
The spelling of 28449907 in words is "twenty-eight million, four hundred forty-nine thousand, nine hundred seven".