28802886 has 36 divisors (see below), whose sum is σ = 67225572. Its totient is φ = 8203104.

The previous prime is 28802881. The next prime is 28802897. The reversal of 28802886 is 68820882.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28802881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 91866 + ... + 92178.

It is an arithmetic number, because the mean of its divisors is an integer number (1867377).

Almost surely, 2^28802886 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28802886, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33612786).

28802886 is an abundant number, since it is smaller than the sum of its proper divisors (38422686).

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

28802886 is an equidigital number, since it uses as much as digits as its factorization.

28802886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645 (or 325 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 42.

The square root of 28802886 is about 5366.8320264379. The cubic root of 28802886 is about 306.5340113609.

Multiplying 28802886 by its product of nonzero digits (98304), we get a square (2831438905344 = 1682688²).

The spelling of 28802886 in words is "twenty-eight million, eight hundred two thousand, eight hundred eighty-six".