2766721 has 4 divisors (see below), whose sum is σ = 2834244. Its totient is φ = 2699200.

The previous prime is 2766713. The next prime is 2766727. The reversal of 2766721 is 1276672.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1476225 + 1290496 = 1215^2 + 1136^2 .

It is a cyclic number.

It is not a de Polignac number, because 2766721 - 2³ = 2766713 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2766727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33700 + ... + 33781.

It is an arithmetic number, because the mean of its divisors is an integer number (708561).

2^2766721 is an apocalyptic number.

It is an amenable number.

2766721 is a deficient number, since it is larger than the sum of its proper divisors (67523).

2766721 is an equidigital number, since it uses as much as digits as its factorization.

2766721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67522.

The product of its digits is 7056, while the sum is 31.

The square root of 2766721 is about 1663.3463259346. The cubic root of 2766721 is about 140.3853499160.

The spelling of 2766721 in words is "two million, seven hundred sixty-six thousand, seven hundred twenty-one".