28282720 has 48 divisors (see below), whose sum is σ = 68257728. Its totient is φ = 11069440.

The previous prime is 28282693. The next prime is 28282739. The reversal of 28282720 is 2728282.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5640 + ... + 9400.

It is an arithmetic number, because the mean of its divisors is an integer number (1422036).

Almost surely, 2^28282720 is an apocalyptic number.

28282720 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 28282720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34128864).

28282720 is an abundant number, since it is smaller than the sum of its proper divisors (39975008).

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

28282720 is a wasteful number, since it uses less digits than its factorization.

28282720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3823 (or 3815 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 31.

The square root of 28282720 is about 5318.1500542952. The cubic root of 28282720 is about 304.6775055849.

The spelling of 28282720 in words is "twenty-eight million, two hundred eighty-two thousand, seven hundred twenty".