28786643 has 2 divisors, whose sum is σ = 28786644. Its totient is φ = 28786642.

The previous prime is 28786621. The next prime is 28786649. The reversal of 28786643 is 34668782.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28786643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28786594 and 28786603.

It is not a weakly prime, because it can be changed into another prime (28786649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14393321 + 14393322.

It is an arithmetic number, because the mean of its divisors is an integer number (14393322).

Almost surely, 2^28786643 is an apocalyptic number.

28786643 is a deficient number, since it is larger than the sum of its proper divisors (1).

28786643 is an equidigital number, since it uses as much as digits as its factorization.

28786643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387072, while the sum is 44.

The square root of 28786643 is about 5365.3185366761. The cubic root of 28786643 is about 306.4763786154.

The spelling of 28786643 in words is "twenty-eight million, seven hundred eighty-six thousand, six hundred forty-three".