2708729 has 4 divisors (see below), whose sum is σ = 2868084. Its totient is φ = 2549376.

The previous prime is 2708711. The next prime is 2708737. The reversal of 2708729 is 9278072.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2036329 + 672400 = 1427^2 + 820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2708729 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2708429) 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, 79652 + ... + 79685.

It is an arithmetic number, because the mean of its divisors is an integer number (717021).

2^2708729 is an apocalyptic number.

It is an amenable number.

2708729 is a deficient number, since it is larger than the sum of its proper divisors (159355).

2708729 is a wasteful number, since it uses less digits than its factorization.

2708729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159354.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 2708729 is about 1645.8216792836. The cubic root of 2708729 is about 139.3975644324.

The spelling of 2708729 in words is "two million, seven hundred eight thousand, seven hundred twenty-nine".