28873561 has 2 divisors, whose sum is σ = 28873562. Its totient is φ = 28873560.

The previous prime is 28873549. The next prime is 28873571. The reversal of 28873561 is 16537882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22467600 + 6405961 = 4740^2 + 2531^2 .

It is a cyclic number.

It is not a de Polignac number, because 28873561 - 2⁵ = 28873529 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28873501) 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, 14436780 + 14436781.

It is an arithmetic number, because the mean of its divisors is an integer number (14436781).

Almost surely, 2^28873561 is an apocalyptic number.

It is an amenable number.

28873561 is a deficient number, since it is larger than the sum of its proper divisors (1).

28873561 is an equidigital number, since it uses as much as digits as its factorization.

28873561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 40.

The square root of 28873561 is about 5373.4124167050. The cubic root of 28873561 is about 306.7845255606.

The spelling of 28873561 in words is "twenty-eight million, eight hundred seventy-three thousand, five hundred sixty-one".