28961057 has 2 divisors, whose sum is σ = 28961058. Its totient is φ = 28961056.

The previous prime is 28961041. The next prime is 28961063. The reversal of 28961057 is 75016982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27363361 + 1597696 = 5231^2 + 1264^2 .

It is a cyclic number.

It is not a de Polignac number, because 28961057 - 2⁴ = 28961041 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28961057.

It is not a weakly prime, because it can be changed into another prime (28961017) 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, 14480528 + 14480529.

It is an arithmetic number, because the mean of its divisors is an integer number (14480529).

Almost surely, 2^28961057 is an apocalyptic number.

It is an amenable number.

28961057 is a deficient number, since it is larger than the sum of its proper divisors (1).

28961057 is an equidigital number, since it uses as much as digits as its factorization.

28961057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 28961057 is about 5381.5478256725. The cubic root of 28961057 is about 307.0940977067.

The spelling of 28961057 in words is "twenty-eight million, nine hundred sixty-one thousand, fifty-seven".