28091598 has 16 divisors (see below), whose sum is σ = 57104976. Its totient is φ = 9210240.

The previous prime is 28091597. The next prime is 28091627. The reversal of 28091598 is 89519082.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28091597) 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 7 ways as a sum of consecutive naturals, for example, 38011 + ... + 38742.

It is an arithmetic number, because the mean of its divisors is an integer number (3569061).

Almost surely, 2^28091598 is an apocalyptic number.

28091598 is an abundant number, since it is smaller than the sum of its proper divisors (29013378).

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

28091598 is a wasteful number, since it uses less digits than its factorization.

28091598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76819.

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 28091598 is about 5300.1507525730. The cubic root of 28091598 is about 303.9896623331.

The spelling of 28091598 in words is "twenty-eight million, ninety-one thousand, five hundred ninety-eight".