28543641 has 16 divisors (see below), whose sum is σ = 43905024. Its totient is φ = 16156944.

The previous prime is 28543639. The next prime is 28543651. The reversal of 28543641 is 14634582.

It is not a de Polignac number, because 28543641 - 2¹ = 28543639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28543651) 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 15 ways as a sum of consecutive naturals, for example, 4105 + ... + 8598.

It is an arithmetic number, because the mean of its divisors is an integer number (2744064).

Almost surely, 2^28543641 is an apocalyptic number.

28543641 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28543641 is a deficient number, since it is larger than the sum of its proper divisors (15361383).

28543641 is a wasteful number, since it uses less digits than its factorization.

28543641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12820.

The product of its digits is 23040, while the sum is 33.

The square root of 28543641 is about 5342.6249166491. The cubic root of 28543641 is about 305.6115687408.

The spelling of 28543641 in words is "twenty-eight million, five hundred forty-three thousand, six hundred forty-one".