28247069 has 2 divisors, whose sum is σ = 28247070. Its totient is φ = 28247068.

The previous prime is 28247033. The next prime is 28247077. The reversal of 28247069 is 96074282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27931225 + 315844 = 5285^2 + 562^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28247069 is a prime.

It is a super-2 number, since 2×28247069² = 1595793814181522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28247969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14123534 + 14123535.

It is an arithmetic number, because the mean of its divisors is an integer number (14123535).

Almost surely, 2^28247069 is an apocalyptic number.

It is an amenable number.

28247069 is a deficient number, since it is larger than the sum of its proper divisors (1).

28247069 is an equidigital number, since it uses as much as digits as its factorization.

28247069 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 38.

The square root of 28247069 is about 5314.7971739287. The cubic root of 28247069 is about 304.5494341582.

The spelling of 28247069 in words is "twenty-eight million, two hundred forty-seven thousand, sixty-nine".