2669821644 has 144 divisors (see below), whose sum is σ = 7761731040. Its totient is φ = 709632000.

The previous prime is 2669821639. The next prime is 2669821657. The reversal of 2669821644 is 4461289662.

It is a super-2 number, since 2×2669821644² = 14255895221541725472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2669821593 and 2669821602.

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 47 ways as a sum of consecutive naturals, for example, 888144 + ... + 891144.

It is an arithmetic number, because the mean of its divisors is an integer number (53900910).

Almost surely, 2^2669821644 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 2669821644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3880865520).

2669821644 is an abundant number, since it is smaller than the sum of its proper divisors (5091909396).

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

2669821644 is a wasteful number, since it uses less digits than its factorization.

2669821644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3128 (or 3119 counting only the distinct ones).

The product of its digits is 995328, while the sum is 48.

The square root of 2669821644 is about 51670.3168560054. The cubic root of 2669821644 is about 1387.2692179429.

The spelling of 2669821644 in words is "two billion, six hundred sixty-nine million, eight hundred twenty-one thousand, six hundred forty-four".