2638191244 has 24 divisors (see below), whose sum is σ = 4985559488. Its totient is φ = 1214300160.

The previous prime is 2638191203. The next prime is 2638191253. The reversal of 2638191244 is 4421918362.

It is a junction number, because it is equal to n+sod(n) for n = 2638191197 and 2638191206.

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, 50037 + ... + 88204.

Almost surely, 2^2638191244 is an apocalyptic number.

It is an amenable number.

2638191244 is a deficient number, since it is larger than the sum of its proper divisors (2347368244).

2638191244 is a wasteful number, since it uses less digits than its factorization.

2638191244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138625 (or 138623 counting only the distinct ones).

The product of its digits is 82944, while the sum is 40.

The square root of 2638191244 is about 51363.3258658354. The cubic root of 2638191244 is about 1381.7689357717.

The spelling of 2638191244 in words is "two billion, six hundred thirty-eight million, one hundred ninety-one thousand, two hundred forty-four".