2729728 has 18 divisors (see below), whose sum is σ = 5449304. Its totient is φ = 1364736.

The previous prime is 2729723. The next prime is 2729729. The reversal of 2729728 is 8279272.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2729723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5076 + ... + 5587.

2^2729728 is an apocalyptic number.

It is an amenable number.

2729728 is a deficient number, since it is larger than the sum of its proper divisors (2719576).

2729728 is an equidigital number, since it uses as much as digits as its factorization.

2729728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10679 (or 10665 counting only the distinct ones).

The product of its digits is 28224, while the sum is 37.

The square root of 2729728 is about 1652.1888511910. The cubic root of 2729728 is about 139.7568568805.

It can be divided in two parts, 272 and 9728, that added together give a 4-th power (10000 = 10⁴).

The spelling of 2729728 in words is "two million, seven hundred twenty-nine thousand, seven hundred twenty-eight".