28188542 has 4 divisors (see below), whose sum is σ = 42282816. Its totient is φ = 14094270.

The previous prime is 28188541. The next prime is 28188553. The reversal of 28188542 is 24588182.

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

It is a junction number, because it is equal to n+sod(n) for n = 28188496 and 28188505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28188541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7047134 + ... + 7047137.

It is an arithmetic number, because the mean of its divisors is an integer number (10570704).

Almost surely, 2^28188542 is an apocalyptic number.

28188542 is a deficient number, since it is larger than the sum of its proper divisors (14094274).

28188542 is a wasteful number, since it uses less digits than its factorization.

28188542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14094273.

The product of its digits is 40960, while the sum is 38.

The square root of 28188542 is about 5309.2882762193. The cubic root of 28188542 is about 304.3389499079.

The spelling of 28188542 in words is "twenty-eight million, one hundred eighty-eight thousand, five hundred forty-two".