28248220 has 192 divisors, whose sum is σ = 85349376. Its totient is φ = 7557120.

The previous prime is 28248179. The next prime is 28248239. The reversal of 28248220 is 2284282.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 340299 + ... + 340381.

It is an arithmetic number, because the mean of its divisors is an integer number (444528).

Almost surely, 2^28248220 is an apocalyptic number.

28248220 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 28248220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42674688).

28248220 is an abundant number, since it is smaller than the sum of its proper divisors (57101156).

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

28248220 is a wasteful number, since it uses less digits than its factorization.

28248220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140 (or 138 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 28.

The square root of 28248220 is about 5314.9054554150. The cubic root of 28248220 is about 304.5535706539.

The spelling of 28248220 in words is "twenty-eight million, two hundred forty-eight thousand, two hundred twenty".