28890643 has 2 divisors, whose sum is σ = 28890644. Its totient is φ = 28890642.

The previous prime is 28890611. The next prime is 28890647. The reversal of 28890643 is 34609882.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28890643 - 2⁵ = 28890611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28890596 and 28890605.

It is not a weakly prime, because it can be changed into another prime (28890647) 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, 14445321 + 14445322.

It is an arithmetic number, because the mean of its divisors is an integer number (14445322).

Almost surely, 2^28890643 is an apocalyptic number.

28890643 is a deficient number, since it is larger than the sum of its proper divisors (1).

28890643 is an equidigital number, since it uses as much as digits as its factorization.

28890643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 28890643 is about 5375.0016744183. The cubic root of 28890643 is about 306.8450129635.

The spelling of 28890643 in words is "twenty-eight million, eight hundred ninety thousand, six hundred forty-three".