2644495812 has 36 divisors (see below), whose sum is σ = 7639655296. Its totient is φ = 755570160.

The previous prime is 2644495811. The next prime is 2644495831. The reversal of 2644495812 is 2185944462.

It is a happy number.

2644495812 is a `hidden beast` number, since 2 + 64 + 4 + 4 + 9 + 581 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (2644495811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5246764 + ... + 5247267.

Almost surely, 2^2644495812 is an apocalyptic number.

It is an amenable number.

2644495812 is an abundant number, since it is smaller than the sum of its proper divisors (4995159484).

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

2644495812 is a wasteful number, since it uses less digits than its factorization.

2644495812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10494048 (or 10494043 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The square root of 2644495812 is about 51424.6615156580. The cubic root of 2644495812 is about 1382.8687456115.

The spelling of 2644495812 in words is "two billion, six hundred forty-four million, four hundred ninety-five thousand, eight hundred twelve".