28889617 has 2 divisors, whose sum is σ = 28889618. Its totient is φ = 28889616.

The previous prime is 28889599. The next prime is 28889639. The reversal of 28889617 is 71698882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16329681 + 12559936 = 4041^2 + 3544^2 .

It is a cyclic number.

It is not a de Polignac number, because 28889617 - 2¹⁹ = 28365329 is a prime.

It is not a weakly prime, because it can be changed into another prime (28889317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14444808 + 14444809.

It is an arithmetic number, because the mean of its divisors is an integer number (14444809).

Almost surely, 2^28889617 is an apocalyptic number.

It is an amenable number.

28889617 is a deficient number, since it is larger than the sum of its proper divisors (1).

28889617 is an equidigital number, since it uses as much as digits as its factorization.

28889617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 49.

The square root of 28889617 is about 5374.9062317402. The cubic root of 28889617 is about 306.8413805682.

The spelling of 28889617 in words is "twenty-eight million, eight hundred eighty-nine thousand, six hundred seventeen".