2787643648 has 18 divisors (see below), whose sum is σ = 5564398574. Its totient is φ = 1393821696.

The previous prime is 2787643643. The next prime is 2787643681. The reversal of 2787643648 is 8463467872.

It can be written as a sum of positive squares in only one way, i.e., 2725675264 + 61968384 = 52208^2 + 7872^2 .

It is not an unprimeable number, because it can be changed into a prime (2787643643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5444361 + ... + 5444872.

Almost surely, 2^2787643648 is an apocalyptic number.

It is an amenable number.

2787643648 is a deficient number, since it is larger than the sum of its proper divisors (2776754926).

2787643648 is an equidigital number, since it uses as much as digits as its factorization.

2787643648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10889249 (or 10889235 counting only the distinct ones).

The product of its digits is 10838016, while the sum is 55.

The square root of 2787643648 is about 52798.1405733194. The cubic root of 2787643648 is about 1407.3833818578.

The spelling of 2787643648 in words is "two billion, seven hundred eighty-seven million, six hundred forty-three thousand, six hundred forty-eight".