2009728 has 32 divisors (see below), whose sum is σ = 4577760. Its totient is φ = 860928.

The previous prime is 2009719. The next prime is 2009731. The reversal of 2009728 is 8279002.

It is a tau number, because it is divible by the number of its divisors (32).

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

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 2009696 and 2009705.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226 + ... + 2017.

It is an arithmetic number, because the mean of its divisors is an integer number (143055).

2^2009728 is an apocalyptic number.

2009728 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2009728 is an abundant number, since it is smaller than the sum of its proper divisors (2568032).

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

2009728 is an equidigital number, since it uses as much as digits as its factorization.

2009728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2264 (or 2252 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 2009728 is about 1417.6487576265. The cubic root of 2009728 is about 126.1960498829.

The spelling of 2009728 in words is "two million, nine thousand, seven hundred twenty-eight".