28581768 has 64 divisors (see below), whose sum is σ = 80164800. Its totient is φ = 9434880.

The previous prime is 28581767. The next prime is 28581769. The reversal of 28581768 is 86718582.

28581768 is a `hidden beast` number, since 2 + 8 + 581 + 7 + 68 = 666.

It is an interprime number because it is at equal distance from previous prime (28581767) and next prime (28581769).

It is not an unprimeable number, because it can be changed into a prime (28581767) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23823 + ... + 24993.

It is an arithmetic number, because the mean of its divisors is an integer number (1252575).

Almost surely, 2^28581768 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 28581768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40082400).

28581768 is an abundant number, since it is smaller than the sum of its proper divisors (51583032).

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

28581768 is a wasteful number, since it uses less digits than its factorization.

28581768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1299 (or 1289 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 28581768 is about 5346.1919157471. The cubic root of 28581768 is about 305.7475811492.

The spelling of 28581768 in words is "twenty-eight million, five hundred eighty-one thousand, seven hundred sixty-eight".