2708721 has 24 divisors (see below), whose sum is σ = 4140864. Its totient is φ = 1769040.

The previous prime is 2708711. The next prime is 2708737. The reversal of 2708721 is 1278072.

2708721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2708721 - 2⁵ = 2708689 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2708701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17175 + ... + 17331.

It is an arithmetic number, because the mean of its divisors is an integer number (172536).

2^2708721 is an apocalyptic number.

It is an amenable number.

2708721 is a deficient number, since it is larger than the sum of its proper divisors (1432143).

2708721 is an equidigital number, since it uses as much as digits as its factorization.

2708721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243 (or 231 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 2708721 is about 1645.8192488849. The cubic root of 2708721 is about 139.3974271993.

The spelling of 2708721 in words is "two million, seven hundred eight thousand, seven hundred twenty-one".