2768721 has 4 divisors (see below), whose sum is σ = 3691632. Its totient is φ = 1845812.

The previous prime is 2768683. The next prime is 2768767. The reversal of 2768721 is 1278672.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2768721 - 2⁶ = 2768657 is a prime.

It is a super-3 number, since 3×2768721³ = 63673517023339408083, which contains 333 as substring.

It is a D-number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2768791) 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, 461451 + ... + 461456.

It is an arithmetic number, because the mean of its divisors is an integer number (922908).

2^2768721 is an apocalyptic number.

It is an amenable number.

2768721 is a deficient number, since it is larger than the sum of its proper divisors (922911).

2768721 is an equidigital number, since it uses as much as digits as its factorization.

2768721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922910.

The product of its digits is 9408, while the sum is 33.

The square root of 2768721 is about 1663.9474150345. The cubic root of 2768721 is about 140.4191688992.

The spelling of 2768721 in words is "two million, seven hundred sixty-eight thousand, seven hundred twenty-one".