28128360 has 192 divisors, whose sum is σ = 97502400. Its totient is φ = 6469632.

The previous prime is 28128349. The next prime is 28128367. The reversal of 28128360 is 6382182.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (28128367) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 385284 + ... + 385356.

It is an arithmetic number, because the mean of its divisors is an integer number (507825).

Almost surely, 2^28128360 is an apocalyptic number.

28128360 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 28128360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48751200).

28128360 is an abundant number, since it is smaller than the sum of its proper divisors (69374040).

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

28128360 is a wasteful number, since it uses less digits than its factorization.

28128360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 115 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 28128360 is about 5303.6176332764. The cubic root of 28128360 is about 304.1222096364.

The spelling of 28128360 in words is "twenty-eight million, one hundred twenty-eight thousand, three hundred sixty".