2720289 has 32 divisors (see below), whose sum is σ = 4523904. Its totient is φ = 1428480.

The previous prime is 2720273. The next prime is 2720297. The reversal of 2720289 is 9820272.

It is not a de Polignac number, because 2720289 - 2⁴ = 2720273 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2720239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7107 + ... + 7479.

It is an arithmetic number, because the mean of its divisors is an integer number (141372).

2^2720289 is an apocalyptic number.

It is an amenable number.

2720289 is a deficient number, since it is larger than the sum of its proper divisors (1803615).

2720289 is a wasteful number, since it uses less digits than its factorization.

2720289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 2720289 is about 1649.3298639144. The cubic root of 2720289 is about 139.5955845983.

The spelling of 2720289 in words is "two million, seven hundred twenty thousand, two hundred eighty-nine".