2170728 has 96 divisors (see below), whose sum is σ = 6926400. Its totient is φ = 601344.

The previous prime is 2170723. The next prime is 2170741. The reversal of 2170728 is 8270712.

It is not an unprimeable number, because it can be changed into a prime (2170723) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29700 + ... + 29772.

It is an arithmetic number, because the mean of its divisors is an integer number (72150).

2^2170728 is an apocalyptic number.

2170728 is a gapful number since it is divisible by the number (28) 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 2170728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3463200).

2170728 is an abundant number, since it is smaller than the sum of its proper divisors (4755672).

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

2170728 is a wasteful number, since it uses less digits than its factorization.

2170728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 144 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 2170728 is about 1473.3390648456. The cubic root of 2170728 is about 129.4797352547.

The spelling of 2170728 in words is "two million, one hundred seventy thousand, seven hundred twenty-eight".