28207643 has 2 divisors, whose sum is σ = 28207644. Its totient is φ = 28207642.

The previous prime is 28207561. The next prime is 28207649. The reversal of 28207643 is 34670282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28207643 - 2¹⁴ = 28191259 is a prime.

It is a super-2 number, since 2×28207643² = 1591342247230898, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28207649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14103821 + 14103822.

It is an arithmetic number, because the mean of its divisors is an integer number (14103822).

Almost surely, 2^28207643 is an apocalyptic number.

28207643 is a deficient number, since it is larger than the sum of its proper divisors (1).

28207643 is an equidigital number, since it uses as much as digits as its factorization.

28207643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 28207643 is about 5311.0868002698. The cubic root of 28207643 is about 304.4076760088.

The spelling of 28207643 in words is "twenty-eight million, two hundred seven thousand, six hundred forty-three".