28874161 has 2 divisors, whose sum is σ = 28874162. Its totient is φ = 28874160.

The previous prime is 28874149. The next prime is 28874189. The reversal of 28874161 is 16147882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24443136 + 4431025 = 4944^2 + 2105^2 .

It is a cyclic number.

It is not a de Polignac number, because 28874161 - 2¹¹ = 28872113 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 28874161.

It is not a weakly prime, because it can be changed into another prime (28874101) 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, 14437080 + 14437081.

It is an arithmetic number, because the mean of its divisors is an integer number (14437081).

Almost surely, 2^28874161 is an apocalyptic number.

It is an amenable number.

28874161 is a deficient number, since it is larger than the sum of its proper divisors (1).

28874161 is an equidigital number, since it uses as much as digits as its factorization.

28874161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21504, while the sum is 37.

The square root of 28874161 is about 5373.4682468588. The cubic root of 28874161 is about 306.7866505662.

The spelling of 28874161 in words is "twenty-eight million, eight hundred seventy-four thousand, one hundred sixty-one".