28761856 has 36 divisors (see below), whose sum is σ = 57759352. Its totient is φ = 14294016.

The previous prime is 28761847. The next prime is 28761857. The reversal of 28761856 is 65816782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28761857) 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 3 ways as a sum of consecutive naturals, for example, 72250 + ... + 72646.

Almost surely, 2^28761856 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 28761856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28879676).

28761856 is an abundant number, since it is smaller than the sum of its proper divisors (28997496).

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

28761856 is an equidigital number, since it uses as much as digits as its factorization.

28761856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696 (or 682 counting only the distinct ones).

The product of its digits is 161280, while the sum is 43.

The square root of 28761856 is about 5363.0081111257. The cubic root of 28761856 is about 306.3883886007.

The spelling of 28761856 in words is "twenty-eight million, seven hundred sixty-one thousand, eight hundred fifty-six".