28635617 has 2 divisors, whose sum is σ = 28635618. Its totient is φ = 28635616.

The previous prime is 28635577. The next prime is 28635619. The reversal of 28635617 is 71653682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18241441 + 10394176 = 4271^2 + 3224^2 .

It is a cyclic number.

It is not a de Polignac number, because 28635617 - 2⁶ = 28635553 is a prime.

Together with 28635619, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28635619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14317808 + 14317809.

It is an arithmetic number, because the mean of its divisors is an integer number (14317809).

Almost surely, 2^28635617 is an apocalyptic number.

It is an amenable number.

28635617 is a deficient number, since it is larger than the sum of its proper divisors (1).

28635617 is an equidigital number, since it uses as much as digits as its factorization.

28635617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 38.

The square root of 28635617 is about 5351.2257474339. The cubic root of 28635617 is about 305.9394735542.

The spelling of 28635617 in words is "twenty-eight million, six hundred thirty-five thousand, six hundred seventeen".