28099791 has 12 divisors (see below), whose sum is σ = 42092232. Its totient is φ = 18733032.

The previous prime is 28099789. The next prime is 28099807. The reversal of 28099791 is 19799082.

It is not a de Polignac number, because 28099791 - 2¹ = 28099789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28099751) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57576 + ... + 58061.

It is an arithmetic number, because the mean of its divisors is an integer number (3507686).

Almost surely, 2^28099791 is an apocalyptic number.

28099791 is a deficient number, since it is larger than the sum of its proper divisors (13992441).

28099791 is an equidigital number, since it uses as much as digits as its factorization.

28099791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115652 (or 115640 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The square root of 28099791 is about 5300.9235987703. The cubic root of 28099791 is about 304.0192126304.

The spelling of 28099791 in words is "twenty-eight million, ninety-nine thousand, seven hundred ninety-one".