28581336 has 80 divisors (see below), whose sum is σ = 91505040. Its totient is φ = 8164800.

The previous prime is 28581317. The next prime is 28581337. The reversal of 28581336 is 63318582.

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 28581336.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28581337) 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 19 ways as a sum of consecutive naturals, for example, 1386 + ... + 7686.

It is an arithmetic number, because the mean of its divisors is an integer number (1143813).

Almost surely, 2^28581336 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 28581336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45752520).

28581336 is an abundant number, since it is smaller than the sum of its proper divisors (62923704).

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

28581336 is a wasteful number, since it uses less digits than its factorization.

28581336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6326 (or 6313 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 28581336 is about 5346.1515130045. The cubic root of 28581336 is about 305.7460407311.

The spelling of 28581336 in words is "twenty-eight million, five hundred eighty-one thousand, three hundred thirty-six".