28443715 has 4 divisors (see below), whose sum is σ = 34132464. Its totient is φ = 22754968.

The previous prime is 28443697. The next prime is 28443731. The reversal of 28443715 is 51734482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51734482 = 2 ⋅25867241.

It is a cyclic number.

It is not a de Polignac number, because 28443715 - 2¹¹ = 28441667 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2844367 + ... + 2844376.

It is an arithmetic number, because the mean of its divisors is an integer number (8533116).

Almost surely, 2^28443715 is an apocalyptic number.

28443715 is a deficient number, since it is larger than the sum of its proper divisors (5688749).

28443715 is an equidigital number, since it uses as much as digits as its factorization.

28443715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5688748.

The product of its digits is 26880, while the sum is 34.

The square root of 28443715 is about 5333.2649474782. The cubic root of 28443715 is about 305.2545219332.

The spelling of 28443715 in words is "twenty-eight million, four hundred forty-three thousand, seven hundred fifteen".