28857816 has 128 divisors (see below), whose sum is σ = 88704000. Its totient is φ = 8636544.

The previous prime is 28857799. The next prime is 28857833. The reversal of 28857816 is 61875882.

It is an interprime number because it is at equal distance from previous prime (28857799) and next prime (28857833).

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 120625 + ... + 120863.

It is an arithmetic number, because the mean of its divisors is an integer number (693000).

Almost surely, 2^28857816 is an apocalyptic number.

28857816 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28857816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44352000).

28857816 is an abundant number, since it is smaller than the sum of its proper divisors (59846184).

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

28857816 is a wasteful number, since it uses less digits than its factorization.

28857816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310 (or 300 counting only the distinct ones).

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

The square root of 28857816 is about 5371.9471330236. The cubic root of 28857816 is about 306.7287513453.

It can be divided in two parts, 2885 and 7816, that added together give a palindrome (10701).

The spelling of 28857816 in words is "twenty-eight million, eight hundred fifty-seven thousand, eight hundred sixteen".