2640644002 has 16 divisors (see below), whose sum is σ = 4030780320. Its totient is φ = 1297080448.

The previous prime is 2640643987. The next prime is 2640644033. The reversal of 2640644002 is 2004460462.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193653 + ... + 206839.

It is an arithmetic number, because the mean of its divisors is an integer number (251923770).

Almost surely, 2^2640644002 is an apocalyptic number.

2640644002 is a deficient number, since it is larger than the sum of its proper divisors (1390136318).

2640644002 is a wasteful number, since it uses less digits than its factorization.

2640644002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14945.

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 2640644002 is about 51387.1968684808. The cubic root of 2640644002 is about 1382.1970188446.

The spelling of 2640644002 in words is "two billion, six hundred forty million, six hundred forty-four thousand, two".