28645817 has 2 divisors, whose sum is σ = 28645818. Its totient is φ = 28645816.

The previous prime is 28645801. The next prime is 28645831. The reversal of 28645817 is 71854682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20259001 + 8386816 = 4501^2 + 2896^2 .

It is a cyclic number.

It is not a de Polignac number, because 28645817 - 2⁴ = 28645801 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28645847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14322908 + 14322909.

It is an arithmetic number, because the mean of its divisors is an integer number (14322909).

Almost surely, 2^28645817 is an apocalyptic number.

It is an amenable number.

28645817 is a deficient number, since it is larger than the sum of its proper divisors (1).

28645817 is an equidigital number, since it uses as much as digits as its factorization.

28645817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 107520, while the sum is 41.

The square root of 28645817 is about 5352.1787152523. The cubic root of 28645817 is about 305.9757944314.

The spelling of 28645817 in words is "twenty-eight million, six hundred forty-five thousand, eight hundred seventeen".