2567721 has 8 divisors (see below), whose sum is σ = 3687040. Its totient is φ = 1580112.

The previous prime is 2567701. The next prime is 2567729. The reversal of 2567721 is 1277652.

2567721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 2567721 - 2¹⁵ = 2534953 is a prime.

It is a super-2 number, since 2×2567721² = 13186382267682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2567729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32881 + ... + 32958.

It is an arithmetic number, because the mean of its divisors is an integer number (460880).

2^2567721 is an apocalyptic number.

It is an amenable number.

2567721 is a deficient number, since it is larger than the sum of its proper divisors (1119319).

2567721 is a wasteful number, since it uses less digits than its factorization.

2567721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65855.

The product of its digits is 5880, while the sum is 30.

The square root of 2567721 is about 1602.4109959683. The cubic root of 2567721 is about 136.9354660807.

The spelling of 2567721 in words is "two million, five hundred sixty-seven thousand, seven hundred twenty-one".