28816840 has 64 divisors (see below), whose sum is σ = 70479360. Its totient is φ = 10540800.

The previous prime is 28816817. The next prime is 28816847. The reversal of 28816840 is 4861882.

It is a self number, because there is not a number n which added to its sum of digits gives 28816840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28816847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78337 + ... + 78703.

It is an arithmetic number, because the mean of its divisors is an integer number (1101240).

Almost surely, 2^28816840 is an apocalyptic number.

28816840 is a gapful number since it is divisible by the number (20) 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 28816840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35239680).

28816840 is an abundant number, since it is smaller than the sum of its proper divisors (41662520).

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

28816840 is a wasteful number, since it uses less digits than its factorization.

28816840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542 (or 538 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 37.

The square root of 28816840 is about 5368.1318910772. The cubic root of 28816840 is about 306.5835050706.

The spelling of 28816840 in words is "twenty-eight million, eight hundred sixteen thousand, eight hundred forty".