28002856 has 32 divisors (see below), whose sum is σ = 60612480. Its totient is φ = 11880000.

The previous prime is 28002841. The next prime is 28002883. The reversal of 28002856 is 65820082.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3181 + ... + 8131.

It is an arithmetic number, because the mean of its divisors is an integer number (1894140).

Almost surely, 2^28002856 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 28002856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30306240).

28002856 is an abundant number, since it is smaller than the sum of its proper divisors (32609624).

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

28002856 is a wasteful number, since it uses less digits than its factorization.

28002856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5065 (or 5061 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 28002856 is about 5291.7724818817. The cubic root of 28002856 is about 303.6692212391.

The spelling of 28002856 in words is "twenty-eight million, two thousand, eight hundred fifty-six".