28386241 has 4 divisors (see below), whose sum is σ = 30569812. Its totient is φ = 26202672.

The previous prime is 28386223. The next prime is 28386251. The reversal of 28386241 is 14268382.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7263025 + 21123216 = 2695^2 + 4596^2 .

It is a cyclic number.

It is not a de Polignac number, because 28386241 - 2¹⁵ = 28353473 is a prime.

It is a super-2 number, since 2×28386241² = 1611557356220162, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28386197 and 28386206.

It is not an unprimeable number, because it can be changed into a prime (28386221) 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 3 ways as a sum of consecutive naturals, for example, 1091766 + ... + 1091791.

It is an arithmetic number, because the mean of its divisors is an integer number (7642453).

Almost surely, 2^28386241 is an apocalyptic number.

It is an amenable number.

28386241 is a deficient number, since it is larger than the sum of its proper divisors (2183571).

28386241 is a wasteful number, since it uses less digits than its factorization.

28386241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2183570.

The product of its digits is 18432, while the sum is 34.

The square root of 28386241 is about 5327.8739662271. The cubic root of 28386241 is about 305.0487819492.

The spelling of 28386241 in words is "twenty-eight million, three hundred eighty-six thousand, two hundred forty-one".