2840728 has 32 divisors (see below), whose sum is σ = 6120000. Its totient is φ = 1222560.

The previous prime is 2840723. The next prime is 2840731. The reversal of 2840728 is 8270482.

It is a self number, because there is not a number n which added to its sum of digits gives 2840728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2840723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 823 + ... + 2521.

It is an arithmetic number, because the mean of its divisors is an integer number (191250).

2^2840728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2840728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3060000).

2840728 is an abundant number, since it is smaller than the sum of its proper divisors (3279272).

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

2840728 is a wasteful number, since it uses less digits than its factorization.

2840728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1735 (or 1731 counting only the distinct ones).

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

The square root of 2840728 is about 1685.4459350570. The cubic root of 2840728 is about 141.6260743370.

The spelling of 2840728 in words is "two million, eight hundred forty thousand, seven hundred twenty-eight".