28381696 has 40 divisors (see below), whose sum is σ = 64817280. Its totient is φ = 12162048.

The previous prime is 28381693. The next prime is 28381711. The reversal of 28381696 is 69618382.

It is not an unprimeable number, because it can be changed into a prime (28381693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 376 + ... + 7543.

It is an arithmetic number, because the mean of its divisors is an integer number (1620432).

Almost surely, 2^28381696 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 28381696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32408640).

28381696 is an abundant number, since it is smaller than the sum of its proper divisors (36435584).

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

28381696 is an frugal number, since it uses more digits than its factorization.

28381696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7944 (or 7928 counting only the distinct ones).

The product of its digits is 124416, while the sum is 43.

The square root of 28381696 is about 5327.4474187926. The cubic root of 28381696 is about 305.0325003439.

The spelling of 28381696 in words is "twenty-eight million, three hundred eighty-one thousand, six hundred ninety-six".