28086442 has 16 divisors (see below), whose sum is σ = 44080200. Its totient is φ = 13404160.

The previous prime is 28086433. The next prime is 28086451. The reversal of 28086442 is 24468082.

It is an interprime number because it is at equal distance from previous prime (28086433) and next prime (28086451).

It can be written as a sum of positive squares in 4 ways, for example, as 23242041 + 4844401 = 4821^2 + 2201^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28086398 and 28086407.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2442 + ... + 7882.

Almost surely, 2^28086442 is an apocalyptic number.

28086442 is a deficient number, since it is larger than the sum of its proper divisors (15993758).

28086442 is a wasteful number, since it uses less digits than its factorization.

28086442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5561.

The product of its (nonzero) digits is 24576, while the sum is 34.

The square root of 28086442 is about 5299.6643289929. The cubic root of 28086442 is about 303.9710628620.

The spelling of 28086442 in words is "twenty-eight million, eighty-six thousand, four hundred forty-two".