28129543 has 12 divisors (see below), whose sum is σ = 32254848. Its totient is φ = 24435840.

The previous prime is 28129537. The next prime is 28129553. The reversal of 28129543 is 34592182.

It is not a de Polignac number, because 28129543 - 2¹³ = 28121351 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28129499 and 28129508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28129513) 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 11 ways as a sum of consecutive naturals, for example, 2023 + ... + 7768.

It is an arithmetic number, because the mean of its divisors is an integer number (2687904).

Almost surely, 2^28129543 is an apocalyptic number.

28129543 is a deficient number, since it is larger than the sum of its proper divisors (4125305).

28129543 is a wasteful number, since it uses less digits than its factorization.

28129543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9834 (or 9821 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 28129543 is about 5303.7291597517. The cubic root of 28129543 is about 304.1264730860.

The spelling of 28129543 in words is "twenty-eight million, one hundred twenty-nine thousand, five hundred forty-three".