28075009 has 2 divisors, whose sum is σ = 28075010. Its totient is φ = 28075008.

The previous prime is 28074983. The next prime is 28075013. The reversal of 28075009 is 90057082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16785409 + 11289600 = 4097^2 + 3360^2 .

It is a cyclic number.

It is not a de Polignac number, because 28075009 - 2²¹ = 25977857 is a prime.

It is a super-2 number, since 2×28075009² = 1576412260700162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28075039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14037504 + 14037505.

It is an arithmetic number, because the mean of its divisors is an integer number (14037505).

Almost surely, 2^28075009 is an apocalyptic number.

It is an amenable number.

28075009 is a deficient number, since it is larger than the sum of its proper divisors (1).

28075009 is an equidigital number, since it uses as much as digits as its factorization.

28075009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 28075009 is about 5298.5855659789. The cubic root of 28075009 is about 303.9298119644.

The spelling of 28075009 in words is "twenty-eight million, seventy-five thousand, nine".