28813791 has 16 divisors (see below), whose sum is σ = 39945600. Its totient is φ = 18452448.

The previous prime is 28813781. The next prime is 28813801. The reversal of 28813791 is 19731882.

It is an interprime number because it is at equal distance from previous prime (28813781) and next prime (28813801).

It is not a de Polignac number, because 28813791 - 2¹¹ = 28811743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28813751) 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, 19020 + ... + 20478.

It is an arithmetic number, because the mean of its divisors is an integer number (2496600).

Almost surely, 2^28813791 is an apocalyptic number.

28813791 is a deficient number, since it is larger than the sum of its proper divisors (11131809).

28813791 is a wasteful number, since it uses less digits than its factorization.

28813791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1718.

The product of its digits is 24192, while the sum is 39.

The square root of 28813791 is about 5367.8478927779. The cubic root of 28813791 is about 306.5726918785.

The spelling of 28813791 in words is "twenty-eight million, eight hundred thirteen thousand, seven hundred ninety-one".