28987443 has 16 divisors (see below), whose sum is σ = 44426400. Its totient is φ = 18658080.

The previous prime is 28987423. The next prime is 28987457. The reversal of 28987443 is 34478982.

It is not a de Polignac number, because 28987443 - 2⁵ = 28987411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28987423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17728 + ... + 19293.

It is an arithmetic number, because the mean of its divisors is an integer number (2776650).

Almost surely, 2^28987443 is an apocalyptic number.

28987443 is a deficient number, since it is larger than the sum of its proper divisors (15438957).

28987443 is a wasteful number, since it uses less digits than its factorization.

28987443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37059 (or 37053 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 28987443 is about 5383.9987927190. The cubic root of 28987443 is about 307.1873323939.

The spelling of 28987443 in words is "twenty-eight million, nine hundred eighty-seven thousand, four hundred forty-three".