28323689 has 2 divisors, whose sum is σ = 28323690. Its totient is φ = 28323688.

The previous prime is 28323671. The next prime is 28323727. The reversal of 28323689 is 98632382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27040000 + 1283689 = 5200^2 + 1133^2 .

It is a cyclic number.

It is not a de Polignac number, because 28323689 - 2¹² = 28319593 is a prime.

It is not a weakly prime, because it can be changed into another prime (28323629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14161844 + 14161845.

It is an arithmetic number, because the mean of its divisors is an integer number (14161845).

Almost surely, 2^28323689 is an apocalyptic number.

It is an amenable number.

28323689 is a deficient number, since it is larger than the sum of its proper divisors (1).

28323689 is an equidigital number, since it uses as much as digits as its factorization.

28323689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 41.

The square root of 28323689 is about 5322.0004697482. Note that the first 3 decimals coincide. The cubic root of 28323689 is about 304.8245483784.

The spelling of 28323689 in words is "twenty-eight million, three hundred twenty-three thousand, six hundred eighty-nine".