28056145 has 16 divisors (see below), whose sum is σ = 36367632. Its totient is φ = 20655360.

The previous prime is 28056143. The next prime is 28056187. The reversal of 28056145 is 54165082.

It can be written as a sum of positive squares in 8 ways, for example, as 1718721 + 26337424 = 1311^2 + 5132^2 .

It is not a de Polignac number, because 28056145 - 2¹ = 28056143 is a prime.

It is a super-2 number, since 2×28056145² = 1574294544522050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28056143) 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 in 15 ways as a sum of consecutive naturals, for example, 42115 + ... + 42775.

It is an arithmetic number, because the mean of its divisors is an integer number (2272977).

Almost surely, 2^28056145 is an apocalyptic number.

It is an amenable number.

28056145 is a deficient number, since it is larger than the sum of its proper divisors (8311487).

28056145 is a wasteful number, since it uses less digits than its factorization.

28056145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 28056145 is about 5296.8051691562. The cubic root of 28056145 is about 303.8617251171.

The spelling of 28056145 in words is "twenty-eight million, fifty-six thousand, one hundred forty-five".