2755687638 has 96 divisors (see below), whose sum is σ = 6404428800. Its totient is φ = 788261760.

The previous prime is 2755687631. The next prime is 2755687651. The reversal of 2755687638 is 8367865572.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2755687631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1318098 + ... + 1320186.

It is an arithmetic number, because the mean of its divisors is an integer number (66712800).

Almost surely, 2^2755687638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2755687638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3202214400).

2755687638 is an abundant number, since it is smaller than the sum of its proper divisors (3648741162).

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

2755687638 is a wasteful number, since it uses less digits than its factorization.

2755687638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2218 (or 2207 counting only the distinct ones).

The product of its digits is 16934400, while the sum is 57.

The square root of 2755687638 is about 52494.6438982112. The cubic root of 2755687638 is about 1401.9848781067.

The spelling of 2755687638 in words is "two billion, seven hundred fifty-five million, six hundred eighty-seven thousand, six hundred thirty-eight".