2644830681 has 8 divisors (see below), whose sum is σ = 3531927840. Its totient is φ = 1760476992.

The previous prime is 2644830673. The next prime is 2644830731. The reversal of 2644830681 is 1860384462.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2644830681 - 2³ = 2644830673 is a prime.

It is a super-2 number, since 2×2644830681² = 13990258662317847522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2644830631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 683616 + ... + 687473.

It is an arithmetic number, because the mean of its divisors is an integer number (441490980).

Almost surely, 2^2644830681 is an apocalyptic number.

It is an amenable number.

2644830681 is a deficient number, since it is larger than the sum of its proper divisors (887097159).

2644830681 is a wasteful number, since it uses less digits than its factorization.

2644830681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1371735.

The product of its (nonzero) digits is 221184, while the sum is 42.

The square root of 2644830681 is about 51427.9173309595. The cubic root of 2644830681 is about 1382.9271134267.

The spelling of 2644830681 in words is "two billion, six hundred forty-four million, eight hundred thirty thousand, six hundred eighty-one".