28260643 has 2 divisors, whose sum is σ = 28260644. Its totient is φ = 28260642.

The previous prime is 28260599. The next prime is 28260649. The reversal of 28260643 is 34606282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28260643 - 2¹³ = 28252451 is a prime.

It is not a weakly prime, because it can be changed into another prime (28260649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14130321 + 14130322.

It is an arithmetic number, because the mean of its divisors is an integer number (14130322).

Almost surely, 2^28260643 is an apocalyptic number.

28260643 is a deficient number, since it is larger than the sum of its proper divisors (1).

28260643 is an equidigital number, since it uses as much as digits as its factorization.

28260643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 28260643 is about 5316.0740213056. The cubic root of 28260643 is about 304.5982096260.

The spelling of 28260643 in words is "twenty-eight million, two hundred sixty thousand, six hundred forty-three".