2981689856 has 40 divisors (see below), whose sum is σ = 5963709444. Its totient is φ = 1489305600.

The previous prime is 2981689849. The next prime is 2981689859. The reversal of 2981689856 is 6589861892.

It can be written as a sum of positive squares in 2 ways, for example, as 2796294400 + 185395456 = 52880^2 + 13616^2 .

It is not an unprimeable number, because it can be changed into a prime (2981689859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 618656 + ... + 623456.

Almost surely, 2^2981689856 is an apocalyptic number.

It is an amenable number.

2981689856 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

2981689856 is an equidigital number, since it uses as much as digits as its factorization.

2981689856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6032 (or 6016 counting only the distinct ones).

The product of its digits is 14929920, while the sum is 62.

The square root of 2981689856 is about 54604.8519455918. The cubic root of 2981689856 is about 1439.3093807684.

The spelling of 2981689856 in words is "two billion, nine hundred eighty-one million, six hundred eighty-nine thousand, eight hundred fifty-six".