28457669 has 2 divisors, whose sum is σ = 28457670. Its totient is φ = 28457668.

The previous prime is 28457641. The next prime is 28457683. The reversal of 28457669 is 96675482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19228225 + 9229444 = 4385^2 + 3038^2 .

It is a cyclic number.

It is not a de Polignac number, because 28457669 - 2⁸ = 28457413 is a prime.

It is a super-2 number, since 2×28457669² = 1619677849827122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28451669) 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, 14228834 + 14228835.

It is an arithmetic number, because the mean of its divisors is an integer number (14228835).

Almost surely, 2^28457669 is an apocalyptic number.

It is an amenable number.

28457669 is a deficient number, since it is larger than the sum of its proper divisors (1).

28457669 is an equidigital number, since it uses as much as digits as its factorization.

28457669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 47.

The square root of 28457669 is about 5334.5729913462. The cubic root of 28457669 is about 305.3044313214.

The spelling of 28457669 in words is "twenty-eight million, four hundred fifty-seven thousand, six hundred sixty-nine".