28289929 has 2 divisors, whose sum is σ = 28289930. Its totient is φ = 28289928.

The previous prime is 28289927. The next prime is 28289939. The reversal of 28289929 is 92998282.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15523600 + 12766329 = 3940^2 + 3573^2 .

It is a cyclic number.

It is not a de Polignac number, because 28289929 - 2¹ = 28289927 is a prime.

Together with 28289927, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28289927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14144964 + 14144965.

It is an arithmetic number, because the mean of its divisors is an integer number (14144965).

Almost surely, 2^28289929 is an apocalyptic number.

It is an amenable number.

28289929 is a deficient number, since it is larger than the sum of its proper divisors (1).

28289929 is an equidigital number, since it uses as much as digits as its factorization.

28289929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 49.

The square root of 28289929 is about 5318.8277843901. The cubic root of 28289929 is about 304.7033898651.

The spelling of 28289929 in words is "twenty-eight million, two hundred eighty-nine thousand, nine hundred twenty-nine".