28756143 has 24 divisors (see below), whose sum is σ = 45169488. Its totient is φ = 17523072.

The previous prime is 28756103. The next prime is 28756153. The reversal of 28756143 is 34165782.

It is not a de Polignac number, because 28756143 - 2²¹ = 26658991 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28756098 and 28756107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28756103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11371 + ... + 13667.

It is an arithmetic number, because the mean of its divisors is an integer number (1882062).

Almost surely, 2^28756143 is an apocalyptic number.

28756143 is a deficient number, since it is larger than the sum of its proper divisors (16413345).

28756143 is a wasteful number, since it uses less digits than its factorization.

28756143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2423 (or 2420 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 28756143 is about 5362.4754544893. The cubic root of 28756143 is about 306.3681011667.

The spelling of 28756143 in words is "twenty-eight million, seven hundred fifty-six thousand, one hundred forty-three".