28185542 has 16 divisors (see below), whose sum is σ = 52710912. Its totient is φ = 10981320.

The previous prime is 28185523. The next prime is 28185583. The reversal of 28185542 is 24558182.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 91358 + ... + 91665.

It is an arithmetic number, because the mean of its divisors is an integer number (3294432).

Almost surely, 2^28185542 is an apocalyptic number.

28185542 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

28185542 is a deficient number, since it is larger than the sum of its proper divisors (24525370).

28185542 is a wasteful number, since it uses less digits than its factorization.

28185542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183043.

The product of its digits is 25600, while the sum is 35.

The square root of 28185542 is about 5309.0057449583. The cubic root of 28185542 is about 304.3281529768.

The spelling of 28185542 in words is "twenty-eight million, one hundred eighty-five thousand, five hundred forty-two".