28718208 has 96 divisors (see below), whose sum is σ = 83816460. Its totient is φ = 9437184.

The previous prime is 28718201. The next prime is 28718227. The reversal of 28718208 is 80281782.

It can be written as a sum of positive squares in 2 ways, for example, as 26132544 + 2585664 = 5112^2 + 1608^2 .

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28718201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111616 + ... + 111872.

Almost surely, 2^28718208 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 28718208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41908230).

28718208 is an abundant number, since it is smaller than the sum of its proper divisors (55098252).

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

28718208 is a wasteful number, since it uses less digits than its factorization.

28718208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374 (or 359 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 28718208 is about 5358.9372080665. The cubic root of 28718208 is about 306.2333219850.

The spelling of 28718208 in words is "twenty-eight million, seven hundred eighteen thousand, two hundred eight".