28321741 has 4 divisors (see below), whose sum is σ = 32367712. Its totient is φ = 24275772.

The previous prime is 28321729. The next prime is 28321747. The reversal of 28321741 is 14712382.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14712382 = 2 ⋅7356191.

It is a cyclic number.

It is not a de Polignac number, because 28321741 - 2¹⁹ = 27797453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28321747) 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 3 ways as a sum of consecutive naturals, for example, 2022975 + ... + 2022988.

It is an arithmetic number, because the mean of its divisors is an integer number (8091928).

Almost surely, 2^28321741 is an apocalyptic number.

It is an amenable number.

28321741 is a deficient number, since it is larger than the sum of its proper divisors (4045971).

28321741 is an equidigital number, since it uses as much as digits as its factorization.

28321741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4045970.

The product of its digits is 2688, while the sum is 28.

The square root of 28321741 is about 5321.8174527129. The cubic root of 28321741 is about 304.8175599781.

The spelling of 28321741 in words is "twenty-eight million, three hundred twenty-one thousand, seven hundred forty-one".