28891744 has 24 divisors (see below), whose sum is σ = 65006928. Its totient is φ = 12382080.

The previous prime is 28891739. The next prime is 28891747. The reversal of 28891744 is 44719882.

It is a self number, because there is not a number n which added to its sum of digits gives 28891744.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28891747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64267 + ... + 64714.

It is an arithmetic number, because the mean of its divisors is an integer number (2708622).

Almost surely, 2^28891744 is an apocalyptic number.

It is an amenable number.

28891744 is an abundant number, since it is smaller than the sum of its proper divisors (36115184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28891744 is a wasteful number, since it uses less digits than its factorization.

28891744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128998 (or 128990 counting only the distinct ones).

The product of its digits is 129024, while the sum is 43.

The square root of 28891744 is about 5375.1040920153. The cubic root of 28891744 is about 306.8489107892.

The spelling of 28891744 in words is "twenty-eight million, eight hundred ninety-one thousand, seven hundred forty-four".