28443811 has 8 divisors (see below), whose sum is σ = 31125744. Its totient is φ = 25777920.

The previous prime is 28443799. The next prime is 28443827. The reversal of 28443811 is 11834482.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28443811 - 2¹⁹ = 27919523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28473811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130 + ... + 7543.

It is an arithmetic number, because the mean of its divisors is an integer number (3890718).

Almost surely, 2^28443811 is an apocalyptic number.

28443811 is a deficient number, since it is larger than the sum of its proper divisors (2681933).

28443811 is a wasteful number, since it uses less digits than its factorization.

28443811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8021.

The product of its digits is 6144, while the sum is 31.

The square root of 28443811 is about 5333.2739475860. The cubic root of 28443811 is about 305.2548653530.

The spelling of 28443811 in words is "twenty-eight million, four hundred forty-three thousand, eight hundred eleven".