28643617 has 2 divisors, whose sum is σ = 28643618. Its totient is φ = 28643616.

The previous prime is 28643609. The next prime is 28643627. The reversal of 28643617 is 71634682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27625536 + 1018081 = 5256^2 + 1009^2 .

It is a cyclic number.

It is not a de Polignac number, because 28643617 - 2³ = 28643609 is a prime.

It is not a weakly prime, because it can be changed into another prime (28643627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14321808 + 14321809.

It is an arithmetic number, because the mean of its divisors is an integer number (14321809).

Almost surely, 2^28643617 is an apocalyptic number.

It is an amenable number.

28643617 is a deficient number, since it is larger than the sum of its proper divisors (1).

28643617 is an equidigital number, since it uses as much as digits as its factorization.

28643617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 37.

The square root of 28643617 is about 5351.9731875263. The cubic root of 28643617 is about 305.9679612461.

The spelling of 28643617 in words is "twenty-eight million, six hundred forty-three thousand, six hundred seventeen".