28273408 has 36 divisors (see below), whose sum is σ = 56843640. Its totient is φ = 14034944.

The previous prime is 28273373. The next prime is 28273409. The reversal of 28273408 is 80437282.

It is not an unprimeable number, because it can be changed into a prime (28273409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45516 + ... + 46132.

It is an arithmetic number, because the mean of its divisors is an integer number (1578990).

Almost surely, 2^28273408 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 28273408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28421820).

28273408 is an abundant number, since it is smaller than the sum of its proper divisors (28570232).

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

28273408 is an equidigital number, since it uses as much as digits as its factorization.

28273408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812 (or 798 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 28273408 is about 5317.2744898115. The cubic root of 28273408 is about 304.6440638655.

The spelling of 28273408 in words is "twenty-eight million, two hundred seventy-three thousand, four hundred eight".