2909209644 has 144 divisors (see below), whose sum is σ = 8263775520. Its totient is φ = 855429120.

The previous prime is 2909209637. The next prime is 2909209649. The reversal of 2909209644 is 4469029092.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2909209644.

It is not an unprimeable number, because it can be changed into a prime (2909209649) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2035122 + ... + 2036550.

It is an arithmetic number, because the mean of its divisors is an integer number (57387330).

Almost surely, 2^2909209644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2909209644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4131887760).

2909209644 is an abundant number, since it is smaller than the sum of its proper divisors (5354565876).

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

2909209644 is a wasteful number, since it uses less digits than its factorization.

2909209644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1600 (or 1595 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 2909209644 is about 53937.0896878947. The cubic root of 2909209644 is about 1427.5511323714.

The spelling of 2909209644 in words is "two billion, nine hundred nine million, two hundred nine thousand, six hundred forty-four".