28908469 has 2 divisors, whose sum is σ = 28908470. Its totient is φ = 28908468.

The previous prime is 28908421. The next prime is 28908487. The reversal of 28908469 is 96480982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17766225 + 11142244 = 4215^2 + 3338^2 .

It is a cyclic number.

It is not a de Polignac number, because 28908469 - 2¹¹ = 28906421 is a prime.

It is a super-2 number, since 2×28908469² = 1671399159847922, 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 (28908409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14454234 + 14454235.

It is an arithmetic number, because the mean of its divisors is an integer number (14454235).

Almost surely, 2^28908469 is an apocalyptic number.

It is an amenable number.

28908469 is a deficient number, since it is larger than the sum of its proper divisors (1).

28908469 is an equidigital number, since it uses as much as digits as its factorization.

28908469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 28908469 is about 5376.6596507497. The cubic root of 28908469 is about 306.9081094546.

The spelling of 28908469 in words is "twenty-eight million, nine hundred eight thousand, four hundred sixty-nine".