2720689 has 8 divisors (see below), whose sum is σ = 2809728. Its totient is φ = 2633040.

The previous prime is 2720687. The next prime is 2720713. The reversal of 2720689 is 9860272.

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 2720689 - 2¹ = 2720687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2720687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4759 + ... + 5299.

It is an arithmetic number, because the mean of its divisors is an integer number (351216).

2^2720689 is an apocalyptic number.

It is an amenable number.

2720689 is a deficient number, since it is larger than the sum of its proper divisors (89039).

2720689 is a wasteful number, since it uses less digits than its factorization.

2720689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 2720689 is about 1649.4511208278. The cubic root of 2720689 is about 139.6024264568.

The spelling of 2720689 in words is "two million, seven hundred twenty thousand, six hundred eighty-nine".