2728739 has 8 divisors (see below), whose sum is σ = 2976960. Its totient is φ = 2486016.

The previous prime is 2728711. The next prime is 2728741. The reversal of 2728739 is 9378272.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-2728739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2728769) 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, 302 + ... + 2355.

It is an arithmetic number, because the mean of its divisors is an integer number (372120).

2^2728739 is an apocalyptic number.

2728739 is a deficient number, since it is larger than the sum of its proper divisors (248221).

2728739 is a wasteful number, since it uses less digits than its factorization.

2728739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2749.

The product of its digits is 42336, while the sum is 38.

The square root of 2728739 is about 1651.8895241511. The cubic root of 2728739 is about 139.7399765384.

The spelling of 2728739 in words is "two million, seven hundred twenty-eight thousand, seven hundred thirty-nine".