28988929 has 2 divisors, whose sum is σ = 28988930. Its totient is φ = 28988928.

The previous prime is 28988903. The next prime is 28988941. The reversal of 28988929 is 92988982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28569025 + 419904 = 5345^2 + 648^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28988929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28988929.

It is not a weakly prime, because it can be changed into another prime (28988959) 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, 14494464 + 14494465.

It is an arithmetic number, because the mean of its divisors is an integer number (14494465).

Almost surely, 2^28988929 is an apocalyptic number.

It is an amenable number.

28988929 is a deficient number, since it is larger than the sum of its proper divisors (1).

28988929 is an equidigital number, since it uses as much as digits as its factorization.

28988929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1492992, while the sum is 55.

The square root of 28988929 is about 5384.1367924673. The cubic root of 28988929 is about 307.1925814780.

The spelling of 28988929 in words is "twenty-eight million, nine hundred eighty-eight thousand, nine hundred twenty-nine".