2720863 has 4 divisors (see below), whose sum is σ = 2725560. Its totient is φ = 2716168.

The previous prime is 2720849. The next prime is 2720881. The reversal of 2720863 is 3680272.

2720863 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 2720863 - 2¹⁷ = 2589791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2720843) 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 3 ways as a sum of consecutive naturals, for example, 1333 + ... + 2686.

It is an arithmetic number, because the mean of its divisors is an integer number (681390).

2^2720863 is an apocalyptic number.

2720863 is a deficient number, since it is larger than the sum of its proper divisors (4697).

2720863 is an equidigital number, since it uses as much as digits as its factorization.

2720863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4696.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 2720863 is about 1649.5038648030. The cubic root of 2720863 is about 139.6054024559.

The spelling of 2720863 in words is "two million, seven hundred twenty thousand, eight hundred sixty-three".