28111242 has 8 divisors (see below), whose sum is σ = 56222496. Its totient is φ = 9370412.

The previous prime is 28111219. The next prime is 28111249. The reversal of 28111242 is 24211182.

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

28111242 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (28111249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2342598 + ... + 2342609.

It is an arithmetic number, because the mean of its divisors is an integer number (7027812).

Almost surely, 2^28111242 is an apocalyptic number.

28111242 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28111242 is a wasteful number, since it uses less digits than its factorization.

28111242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4685212.

The product of its digits is 256, while the sum is 21.

The square root of 28111242 is about 5302.0035835522. The cubic root of 28111242 is about 304.0605041738.

The spelling of 28111242 in words is "twenty-eight million, one hundred eleven thousand, two hundred forty-two".