2691644128 has 48 divisors (see below), whose sum is σ = 5432857920. Its totient is φ = 1312093696.

The previous prime is 2691644117. The next prime is 2691644183. The reversal of 2691644128 is 8214461962.

It is a super-2 number, since 2×2691644128² = 14489896223593760768, which contains 22 as substring.

It is a congruent number.

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, 401250 + ... + 407902.

It is an arithmetic number, because the mean of its divisors is an integer number (113184540).

Almost surely, 2^2691644128 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 2691644128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2716428960).

2691644128 is an abundant number, since it is smaller than the sum of its proper divisors (2741213792).

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

2691644128 is a wasteful number, since it uses less digits than its factorization.

2691644128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6979 (or 6971 counting only the distinct ones).

The product of its digits is 165888, while the sum is 43.

The square root of 2691644128 is about 51881.0575065698. The cubic root of 2691644128 is about 1391.0387019063.

The spelling of 2691644128 in words is "two billion, six hundred ninety-one million, six hundred forty-four thousand, one hundred twenty-eight".