28290643 has 2 divisors, whose sum is σ = 28290644. Its totient is φ = 28290642.

The previous prime is 28290599. The next prime is 28290649. The reversal of 28290643 is 34609282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28290643 - 2⁹ = 28290131 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28290599 and 28290608.

It is not a weakly prime, because it can be changed into another prime (28290649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14145321 + 14145322.

It is an arithmetic number, because the mean of its divisors is an integer number (14145322).

Almost surely, 2^28290643 is an apocalyptic number.

28290643 is a deficient number, since it is larger than the sum of its proper divisors (1).

28290643 is an equidigital number, since it uses as much as digits as its factorization.

28290643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 28290643 is about 5318.8949040191. The cubic root of 28290643 is about 304.7059532790.

The spelling of 28290643 in words is "twenty-eight million, two hundred ninety thousand, six hundred forty-three".