28442791 has 8 divisors (see below), whose sum is σ = 32243120. Its totient is φ = 24872832.

The previous prime is 28442749. The next prime is 28442797. The reversal of 28442791 is 19724482.

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

It is a cyclic number.

It is not a de Polignac number, because 28442791 - 2⁹ = 28442279 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28442791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28442797) 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, 57330 + ... + 57823.

It is an arithmetic number, because the mean of its divisors is an integer number (4030390).

Almost surely, 2^28442791 is an apocalyptic number.

28442791 is a deficient number, since it is larger than the sum of its proper divisors (3800329).

28442791 is a wasteful number, since it uses less digits than its factorization.

28442791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115185.

The product of its digits is 32256, while the sum is 37.

The square root of 28442791 is about 5333.1783206640. The cubic root of 28442791 is about 305.2512164786.

The spelling of 28442791 in words is "twenty-eight million, four hundred forty-two thousand, seven hundred ninety-one".