2720661 has 8 divisors (see below), whose sum is σ = 3687264. Its totient is φ = 1783920.

The previous prime is 2720623. The next prime is 2720671. The reversal of 2720661 is 1660272.

It is a happy number.

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

It is not a de Polignac number, because 2720661 - 2⁹ = 2720149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2720671) 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, 7251 + ... + 7616.

It is an arithmetic number, because the mean of its divisors is an integer number (460908).

2^2720661 is an apocalyptic number.

It is an amenable number.

2720661 is a deficient number, since it is larger than the sum of its proper divisors (966603).

2720661 is a wasteful number, since it uses less digits than its factorization.

2720661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14931.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 2720661 is about 1649.4426331340. The cubic root of 2720661 is about 139.6019475485.

The spelling of 2720661 in words is "two million, seven hundred twenty thousand, six hundred sixty-one".