28241643 has 4 divisors (see below), whose sum is σ = 37655528. Its totient is φ = 18827760.

The previous prime is 28241627. The next prime is 28241671. The reversal of 28241643 is 34614282.

28241643 is nontrivially palindromic in base 2.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28241643 - 2⁴ = 28241627 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28241643.

It is not an unprimeable number, because it can be changed into a prime (28241623) 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, 4706938 + ... + 4706943.

It is an arithmetic number, because the mean of its divisors is an integer number (9413882).

Almost surely, 2^28241643 is an apocalyptic number.

28241643 is a deficient number, since it is larger than the sum of its proper divisors (9413885).

28241643 is an equidigital number, since it uses as much as digits as its factorization.

28241643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9413884.

The product of its digits is 9216, while the sum is 30.

The square root of 28241643 is about 5314.2866877879. The cubic root of 28241643 is about 304.5299325355.

The spelling of 28241643 in words is "twenty-eight million, two hundred forty-one thousand, six hundred forty-three".