28945717 has 2 divisors, whose sum is σ = 28945718. Its totient is φ = 28945716.

The previous prime is 28945687. The next prime is 28945727. The reversal of 28945717 is 71754982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27973521 + 972196 = 5289^2 + 986^2 .

It is a cyclic number.

It is not a de Polignac number, because 28945717 - 2⁷ = 28945589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28945727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14472858 + 14472859.

It is an arithmetic number, because the mean of its divisors is an integer number (14472859).

Almost surely, 2^28945717 is an apocalyptic number.

It is an amenable number.

28945717 is a deficient number, since it is larger than the sum of its proper divisors (1).

28945717 is an equidigital number, since it uses as much as digits as its factorization.

28945717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 43.

The square root of 28945717 is about 5380.1223963772. The cubic root of 28945717 is about 307.0398679245.

The spelling of 28945717 in words is "twenty-eight million, nine hundred forty-five thousand, seven hundred seventeen".