2638171860 has 48 divisors (see below), whose sum is σ = 7821406656. Its totient is φ = 662129152.

The previous prime is 2638171709. The next prime is 2638171871. The reversal of 2638171860 is 681718362.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1292202 + ... + 1294241.

It is an arithmetic number, because the mean of its divisors is an integer number (162945972).

Almost surely, 2^2638171860 is an apocalyptic number.

2638171860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2638171860 is an abundant number, since it is smaller than the sum of its proper divisors (5183234796).

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

2638171860 is a wasteful number, since it uses less digits than its factorization.

2638171860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2586472 (or 2586470 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 2638171860 is about 51363.1371705428. The cubic root of 2638171860 is about 1381.7655516002.

The spelling of 2638171860 in words is "two billion, six hundred thirty-eight million, one hundred seventy-one thousand, eight hundred sixty".