28081732 has 48 divisors (see below), whose sum is σ = 58060800. Its totient is φ = 11636352.

The previous prime is 28081727. The next prime is 28081733. The reversal of 28081732 is 23718082.

It is a junction number, because it is equal to n+sod(n) for n = 28081694 and 28081703.

It is not an unprimeable number, because it can be changed into a prime (28081733) 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 15 ways as a sum of consecutive naturals, for example, 188394 + ... + 188542.

It is an arithmetic number, because the mean of its divisors is an integer number (1209600).

Almost surely, 2^28081732 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 28081732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29030400).

28081732 is an abundant number, since it is smaller than the sum of its proper divisors (29979068).

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

28081732 is a wasteful number, since it uses less digits than its factorization.

28081732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340 (or 338 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 28081732 is about 5299.2199425953. The cubic root of 28081732 is about 303.9540702771.

The spelling of 28081732 in words is "twenty-eight million, eighty-one thousand, seven hundred thirty-two".