28744143 has 4 divisors (see below), whose sum is σ = 38325528. Its totient is φ = 19162760.

The previous prime is 28744141. The next prime is 28744193. The reversal of 28744143 is 34144782.

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 28744143 - 2¹ = 28744141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28744141) 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, 4790688 + ... + 4790693.

It is an arithmetic number, because the mean of its divisors is an integer number (9581382).

Almost surely, 2^28744143 is an apocalyptic number.

28744143 is a deficient number, since it is larger than the sum of its proper divisors (9581385).

28744143 is an equidigital number, since it uses as much as digits as its factorization.

28744143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9581384.

The product of its digits is 21504, while the sum is 33.

The square root of 28744143 is about 5361.3564514962. The cubic root of 28744143 is about 306.3254792160.

The spelling of 28744143 in words is "twenty-eight million, seven hundred forty-four thousand, one hundred forty-three".