28271320 has 128 divisors (see below), whose sum is σ = 81077760. Its totient is φ = 8616960.

The previous prime is 28271311. The next prime is 28271359. The reversal of 28271320 is 2317282.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 206292 + ... + 206428.

It is an arithmetic number, because the mean of its divisors is an integer number (633420).

Almost surely, 2^28271320 is an apocalyptic number.

28271320 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 28271320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40538880).

28271320 is an abundant number, since it is smaller than the sum of its proper divisors (52806440).

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

28271320 is a wasteful number, since it uses less digits than its factorization.

28271320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233 (or 229 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 28271320 is about 5317.0781449966. The cubic root of 28271320 is about 304.6365643278.

The spelling of 28271320 in words is "twenty-eight million, two hundred seventy-one thousand, three hundred twenty".