28187142 has 32 divisors (see below), whose sum is σ = 57729024. Its totient is φ = 9172800.

The previous prime is 28187129. The next prime is 28187161. The reversal of 28187142 is 24178182.

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 (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53842 + ... + 54362.

It is an arithmetic number, because the mean of its divisors is an integer number (1804032).

Almost surely, 2^28187142 is an apocalyptic number.

28187142 is an abundant number, since it is smaller than the sum of its proper divisors (29541882).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28187142 is a wasteful number, since it uses less digits than its factorization.

28187142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724.

The product of its digits is 7168, while the sum is 33.

The square root of 28187142 is about 5309.1564301685. The cubic root of 28187142 is about 304.3339114354. Note that the first 3 decimals are identical.

The spelling of 28187142 in words is "twenty-eight million, one hundred eighty-seven thousand, one hundred forty-two".