28306669 has 2 divisors, whose sum is σ = 28306670. Its totient is φ = 28306668.

The previous prime is 28306657. The next prime is 28306679. The reversal of 28306669 is 96660382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25704900 + 2601769 = 5070^2 + 1613^2 .

It is a cyclic number.

It is not a de Polignac number, because 28306669 - 2⁷ = 28306541 is a prime.

It is a super-2 number, since 2×28306669² = 1602535019751122, 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 (28306609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14153334 + 14153335.

It is an arithmetic number, because the mean of its divisors is an integer number (14153335).

Almost surely, 2^28306669 is an apocalyptic number.

It is an amenable number.

28306669 is a deficient number, since it is larger than the sum of its proper divisors (1).

28306669 is an equidigital number, since it uses as much as digits as its factorization.

28306669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 28306669 is about 5320.4012066761. The cubic root of 28306669 is about 304.7634787280.

The spelling of 28306669 in words is "twenty-eight million, three hundred six thousand, six hundred sixty-nine".