28868340 has 96 divisors (see below), whose sum is σ = 85639680. Its totient is φ = 7254016.

The previous prime is 28868327. The next prime is 28868341. The reversal of 28868340 is 4386882.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28868341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81604 + ... + 81956.

It is an arithmetic number, because the mean of its divisors is an integer number (892080).

Almost surely, 2^28868340 is an apocalyptic number.

28868340 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 28868340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42819840).

28868340 is an abundant number, since it is smaller than the sum of its proper divisors (56771340).

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

28868340 is a wasteful number, since it uses less digits than its factorization.

28868340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441 (or 439 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 39.

The square root of 28868340 is about 5372.9265768294. The cubic root of 28868340 is about 306.7660332271.

The spelling of 28868340 in words is "twenty-eight million, eight hundred sixty-eight thousand, three hundred forty".