28891743 has 16 divisors (see below), whose sum is σ = 40782720. Its totient is φ = 18162144.

The previous prime is 28891739. The next prime is 28891747. The reversal of 28891743 is 34719882.

It is an interprime number because it is at equal distance from previous prime (28891739) and next prime (28891747).

It is not a de Polignac number, because 28891743 - 2² = 28891739 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28891695 and 28891704.

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 15 ways as a sum of consecutive naturals, for example, 121 + ... + 7602.

It is an arithmetic number, because the mean of its divisors is an integer number (2548920).

Almost surely, 2^28891743 is an apocalyptic number.

28891743 is a deficient number, since it is larger than the sum of its proper divisors (11890977).

28891743 is a wasteful number, since it uses less digits than its factorization.

28891743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7798.

The product of its digits is 96768, while the sum is 42.

The square root of 28891743 is about 5375.1039989939. The cubic root of 28891743 is about 306.8489072490.

The spelling of 28891743 in words is "twenty-eight million, eight hundred ninety-one thousand, seven hundred forty-three".