28061143 has 4 divisors (see below), whose sum is σ = 30612168. Its totient is φ = 25510120.

The previous prime is 28061123. The next prime is 28061161. The reversal of 28061143 is 34116082.

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

It is a cyclic number.

It is not a de Polignac number, because 28061143 - 2⁹ = 28060631 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 (28061123) 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, 1275496 + ... + 1275517.

It is an arithmetic number, because the mean of its divisors is an integer number (7653042).

Almost surely, 2^28061143 is an apocalyptic number.

28061143 is a deficient number, since it is larger than the sum of its proper divisors (2551025).

28061143 is a wasteful number, since it uses less digits than its factorization.

28061143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2551024.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 28061143 is about 5297.2769419769. The cubic root of 28061143 is about 303.8797676377.

The spelling of 28061143 in words is "twenty-eight million, sixty-one thousand, one hundred forty-three".