840728 has 16 divisors (see below), whose sum is σ = 1801680. Its totient is φ = 360288.

The previous prime is 840727. The next prime is 840733. The reversal of 840728 is 827048.

It is a self number, because there is not a number n which added to its sum of digits gives 840728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7451 + ... + 7562.

It is an arithmetic number, because the mean of its divisors is an integer number (112605).

2⁸⁴⁰⁷²⁸ is an apocalyptic number.

It is an amenable number.

840728 is an abundant number, since it is smaller than the sum of its proper divisors (960952).

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

840728 is a wasteful number, since it uses less digits than its factorization.

840728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15026 (or 15022 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 840728 is about 916.9122095381. The cubic root of 840728 is about 94.3811295231.

The spelling of 840728 in words is "eight hundred forty thousand, seven hundred twenty-eight".