2720605 has 8 divisors (see below), whose sum is σ = 3274200. Its totient is φ = 2170176.

The previous prime is 2720603. The next prime is 2720609. The reversal of 2720605 is 5060272.

2720605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 568516 + 2152089 = 754^2 + 1467^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2720605 - 2¹ = 2720603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2720603) 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 7 ways as a sum of consecutive naturals, for example, 2011 + ... + 3079.

It is an arithmetic number, because the mean of its divisors is an integer number (409275).

2^2720605 is an apocalyptic number.

It is an amenable number.

2720605 is a deficient number, since it is larger than the sum of its proper divisors (553595).

2720605 is a wasteful number, since it uses less digits than its factorization.

2720605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1583.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 2720605 is about 1649.4256576154. The cubic root of 2720605 is about 139.6009897221.

Adding to 2720605 its reverse (5060272), we get a palindrome (7780877).

The spelling of 2720605 in words is "two million, seven hundred twenty thousand, six hundred five".