28891443 has 8 divisors (see below), whose sum is σ = 44025088. Its totient is φ = 16509384.

The previous prime is 28891433. The next prime is 28891451. The reversal of 28891443 is 34419882.

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

It is not a de Polignac number, because 28891443 - 2¹² = 28887347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28891403) 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, 687871 + ... + 687912.

It is an arithmetic number, because the mean of its divisors is an integer number (5503136).

Almost surely, 2^28891443 is an apocalyptic number.

28891443 is a deficient number, since it is larger than the sum of its proper divisors (15133645).

28891443 is a wasteful number, since it uses less digits than its factorization.

28891443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1375793.

The product of its digits is 55296, while the sum is 39.

The square root of 28891443 is about 5375.0760924846. The cubic root of 28891443 is about 306.8478451809.

The spelling of 28891443 in words is "twenty-eight million, eight hundred ninety-one thousand, four hundred forty-three".