28091196 has 72 divisors (see below), whose sum is σ = 85438080. Its totient is φ = 7602336.

The previous prime is 28091183. The next prime is 28091197. The reversal of 28091196 is 69119082.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 28091196.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28091197) 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 23 ways as a sum of consecutive naturals, for example, 1855 + ... + 7721.

It is an arithmetic number, because the mean of its divisors is an integer number (1186640).

Almost surely, 2^28091196 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28091196, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42719040).

28091196 is an abundant number, since it is smaller than the sum of its proper divisors (57346884).

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

28091196 is a wasteful number, since it uses less digits than its factorization.

28091196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5903 (or 5898 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 28091196 is about 5300.1128289877. The cubic root of 28091196 is about 303.9882122622.

It can be divided in two parts, 2809 and 1196, that added together give a triangular number (4005 = T₈₉).

The spelling of 28091196 in words is "twenty-eight million, ninety-one thousand, one hundred ninety-six".