2640640321 has 8 divisors (see below), whose sum is σ = 2884493088. Its totient is φ = 2397420000.

The previous prime is 2640640297. The next prime is 2640640337. The reversal of 2640640321 is 1230460462.

2640640321 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 a cyclic number.

It is not a de Polignac number, because 2640640321 - 2⁷ = 2640640193 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2640640321.

It is not an unprimeable number, because it can be changed into a prime (2640640421) 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, 149355 + ... + 166096.

It is an arithmetic number, because the mean of its divisors is an integer number (360561636).

Almost surely, 2^2640640321 is an apocalyptic number.

It is an amenable number.

2640640321 is a deficient number, since it is larger than the sum of its proper divisors (243852767).

2640640321 is a wasteful number, since it uses less digits than its factorization.

2640640321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316223.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 2640640321 is about 51387.1610521539. The cubic root of 2640640321 is about 1382.1963765935.

The spelling of 2640640321 in words is "two billion, six hundred forty million, six hundred forty thousand, three hundred twenty-one".