28559917 has 2 divisors, whose sum is σ = 28559918. Its totient is φ = 28559916.

The previous prime is 28559911. The next prime is 28559929. The reversal of 28559917 is 71995582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16924996 + 11634921 = 4114^2 + 3411^2 .

It is a cyclic number.

It is not a de Polignac number, because 28559917 - 2⁷ = 28559789 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28559911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14279958 + 14279959.

It is an arithmetic number, because the mean of its divisors is an integer number (14279959).

Almost surely, 2^28559917 is an apocalyptic number.

It is an amenable number.

28559917 is a deficient number, since it is larger than the sum of its proper divisors (1).

28559917 is an equidigital number, since it uses as much as digits as its factorization.

28559917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 46.

The square root of 28559917 is about 5344.1479208570. The cubic root of 28559917 is about 305.6696457599.

The spelling of 28559917 in words is "twenty-eight million, five hundred fifty-nine thousand, nine hundred seventeen".