2644649964 has 72 divisors (see below), whose sum is σ = 7298617872. Its totient is φ = 800772480.

The previous prime is 2644649951. The next prime is 2644649971. The reversal of 2644649964 is 4699464462.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 2644649964.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 811362 + ... + 814614.

Almost surely, 2^2644649964 is an apocalyptic number.

It is an amenable number.

2644649964 is an abundant number, since it is smaller than the sum of its proper divisors (4653967908).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2644649964 is a wasteful number, since it uses less digits than its factorization.

2644649964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5327 (or 5322 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 54.

The square root of 2644649964 is about 51426.1603077655. The cubic root of 2644649964 is about 1382.8956149854.

The spelling of 2644649964 in words is "two billion, six hundred forty-four million, six hundred forty-nine thousand, nine hundred sixty-four".