28541643 has 32 divisors (see below), whose sum is σ = 43739136. Its totient is φ = 16418688.

The previous prime is 28541627. The next prime is 28541647. The reversal of 28541643 is 34614582.

It is not a de Polignac number, because 28541643 - 2⁴ = 28541627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28541647) 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 31 ways as a sum of consecutive naturals, for example, 41821 + ... + 42497.

It is an arithmetic number, because the mean of its divisors is an integer number (1366848).

Almost surely, 2^28541643 is an apocalyptic number.

28541643 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

28541643 is a deficient number, since it is larger than the sum of its proper divisors (15197493).

28541643 is a wasteful number, since it uses less digits than its factorization.

28541643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763.

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

The square root of 28541643 is about 5342.4379266399. The cubic root of 28541643 is about 305.6044378336.

The spelling of 28541643 in words is "twenty-eight million, five hundred forty-one thousand, six hundred forty-three".