28547689 has 2 divisors, whose sum is σ = 28547690. Its totient is φ = 28547688.

The previous prime is 28547639. The next prime is 28547693. The reversal of 28547689 is 98674582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16933225 + 11614464 = 4115^2 + 3408^2 .

It is a cyclic number.

It is not a de Polignac number, because 28547689 - 2¹⁷ = 28416617 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28547639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14273844 + 14273845.

It is an arithmetic number, because the mean of its divisors is an integer number (14273845).

Almost surely, 2^28547689 is an apocalyptic number.

It is an amenable number.

28547689 is a deficient number, since it is larger than the sum of its proper divisors (1).

28547689 is an equidigital number, since it uses as much as digits as its factorization.

28547689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 967680, while the sum is 49.

The square root of 28547689 is about 5343.0037432141. The cubic root of 28547689 is about 305.6260151243.

It can be divided in two parts, 285 and 47689, that added together give a palindrome (47974).

The spelling of 28547689 in words is "twenty-eight million, five hundred forty-seven thousand, six hundred eighty-nine".