28872973 has 2 divisors, whose sum is σ = 28872974. Its totient is φ = 28872972.

The previous prime is 28872967. The next prime is 28872983. The reversal of 28872973 is 37927882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28869129 + 3844 = 5373^2 + 62^2 .

It is a cyclic number.

It is not a de Polignac number, because 28872973 - 2⁹ = 28872461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28872983) 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, 14436486 + 14436487.

It is an arithmetic number, because the mean of its divisors is an integer number (14436487).

Almost surely, 2^28872973 is an apocalyptic number.

It is an amenable number.

28872973 is a deficient number, since it is larger than the sum of its proper divisors (1).

28872973 is an equidigital number, since it uses as much as digits as its factorization.

28872973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 46.

The square root of 28872973 is about 5373.3577025916. The cubic root of 28872973 is about 306.7824430265.

The spelling of 28872973 in words is "twenty-eight million, eight hundred seventy-two thousand, nine hundred seventy-three".