28455643 has 2 divisors, whose sum is σ = 28455644. Its totient is φ = 28455642.

The previous prime is 28455617. The next prime is 28455653. The reversal of 28455643 is 34655482.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28455643 - 2⁵ = 28455611 is a prime.

It is not a weakly prime, because it can be changed into another prime (28455653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14227821 + 14227822.

It is an arithmetic number, because the mean of its divisors is an integer number (14227822).

Almost surely, 2^28455643 is an apocalyptic number.

28455643 is a deficient number, since it is larger than the sum of its proper divisors (1).

28455643 is an equidigital number, since it uses as much as digits as its factorization.

28455643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 115200, while the sum is 37.

The square root of 28455643 is about 5334.3830946043. The cubic root of 28455643 is about 305.2971859229.

The spelling of 28455643 in words is "twenty-eight million, four hundred fifty-five thousand, six hundred forty-three".