28503816 has 64 divisors (see below), whose sum is σ = 78580800. Its totient is φ = 8544000.

The previous prime is 28503791. The next prime is 28503823. The reversal of 28503816 is 61830582.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

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 15 ways as a sum of consecutive naturals, for example, 26130 + ... + 27198.

It is an arithmetic number, because the mean of its divisors is an integer number (1227825).

Almost surely, 2^28503816 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 28503816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39290400).

28503816 is an abundant number, since it is smaller than the sum of its proper divisors (50076984).

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

28503816 is a wasteful number, since it uses less digits than its factorization.

28503816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1190 (or 1186 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 28503816 is about 5338.8965151986. The cubic root of 28503816 is about 305.4693695779.

It can be divided in two parts, 2850 and 3816, that added together give a palindrome (6666).

The spelling of 28503816 in words is "twenty-eight million, five hundred three thousand, eight hundred sixteen".