28677989 has 2 divisors, whose sum is σ = 28677990. Its totient is φ = 28677988.

The previous prime is 28677959. The next prime is 28678019. The reversal of 28677989 is 98977682.

It is a balanced prime because it is at equal distance from previous prime (28677959) and next prime (28678019).

It can be written as a sum of positive squares in only one way, i.e., 27984100 + 693889 = 5290^2 + 833^2 .

It is a cyclic number.

It is not a de Polignac number, because 28677989 - 2¹⁶ = 28612453 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28677919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14338994 + 14338995.

It is an arithmetic number, because the mean of its divisors is an integer number (14338995).

Almost surely, 2^28677989 is an apocalyptic number.

It is an amenable number.

28677989 is a deficient number, since it is larger than the sum of its proper divisors (1).

28677989 is an equidigital number, since it uses as much as digits as its factorization.

28677989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3048192, while the sum is 56.

The square root of 28677989 is about 5355.1833768789. The cubic root of 28677989 is about 306.0902982973.

The spelling of 28677989 in words is "twenty-eight million, six hundred seventy-seven thousand, nine hundred eighty-nine".