2638555878 has 32 divisors (see below), whose sum is σ = 6348407040. Its totient is φ = 714195360.

The previous prime is 2638555849. The next prime is 2638555891. The reversal of 2638555878 is 8785558362.

It is a happy number.

2638555878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1652433 + ... + 1654028.

It is an arithmetic number, because the mean of its divisors is an integer number (198387720).

Almost surely, 2^2638555878 is an apocalyptic number.

2638555878 is an abundant number, since it is smaller than the sum of its proper divisors (3709851162).

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

2638555878 is a wasteful number, since it uses less digits than its factorization.

2638555878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3306492.

The product of its digits is 16128000, while the sum is 57.

The square root of 2638555878 is about 51366.8752991653. The cubic root of 2638555878 is about 1381.8325926079.

The spelling of 2638555878 in words is "two billion, six hundred thirty-eight million, five hundred fifty-five thousand, eight hundred seventy-eight".