28043143 has 4 divisors (see below), whose sum is σ = 28056688. Its totient is φ = 28029600.

The previous prime is 28043131. The next prime is 28043153. The reversal of 28043143 is 34134082.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28043143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28043153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2946 + ... + 8047.

It is an arithmetic number, because the mean of its divisors is an integer number (7014172).

Almost surely, 2^28043143 is an apocalyptic number.

28043143 is a deficient number, since it is larger than the sum of its proper divisors (13545).

28043143 is a wasteful number, since it uses less digits than its factorization.

28043143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13544.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 28043143 is about 5295.5776833127. The cubic root of 28043143 is about 303.8147785318.

The spelling of 28043143 in words is "twenty-eight million, forty-three thousand, one hundred forty-three".