28165143 has 8 divisors (see below), whose sum is σ = 38765056. Its totient is φ = 18171000.

The previous prime is 28165117. The next prime is 28165147. The reversal of 28165143 is 34156182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28165143 - 2¹⁰ = 28164119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28165143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28165147) by changing a digit.

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, 151333 + ... + 151518.

It is an arithmetic number, because the mean of its divisors is an integer number (4845632).

Almost surely, 2^28165143 is an apocalyptic number.

28165143 is a deficient number, since it is larger than the sum of its proper divisors (10599913).

28165143 is a wasteful number, since it uses less digits than its factorization.

28165143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302885.

The product of its digits is 5760, while the sum is 30.

The square root of 28165143 is about 5307.0842277092. The cubic root of 28165143 is about 304.2547171203.

The spelling of 28165143 in words is "twenty-eight million, one hundred sixty-five thousand, one hundred forty-three".