2764721 has 4 divisors (see below), whose sum is σ = 2768244. Its totient is φ = 2761200.

The previous prime is 2764711. The next prime is 2764739. The reversal of 2764721 is 1274672.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2217121 + 547600 = 1489^2 + 740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2764721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2764711) 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, 11 + ... + 2351.

It is an arithmetic number, because the mean of its divisors is an integer number (692061).

2^2764721 is an apocalyptic number.

It is an amenable number.

2764721 is a deficient number, since it is larger than the sum of its proper divisors (3523).

2764721 is a wasteful number, since it uses less digits than its factorization.

2764721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3522.

The product of its digits is 4704, while the sum is 29.

The square root of 2764721 is about 1662.7450195385. The cubic root of 2764721 is about 140.3515146310.

The spelling of 2764721 in words is "two million, seven hundred sixty-four thousand, seven hundred twenty-one".