6638612838 has 64 divisors (see below), whose sum is σ = 15892837632. Its totient is φ = 1821905280.

The previous prime is 6638612801. The next prime is 6638612857. The reversal of 6638612838 is 8382168366.

6638612838 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27520 + ... + 118467.

It is an arithmetic number, because the mean of its divisors is an integer number (248325588).

Almost surely, 2^6638612838 is an apocalyptic number.

6638612838 is an abundant number, since it is smaller than the sum of its proper divisors (9254224794).

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

6638612838 is a wasteful number, since it uses less digits than its factorization.

6638612838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146069.

The product of its digits is 1990656, while the sum is 51.

The square root of 6638612838 is about 81477.6830672056. The cubic root of 6638612838 is about 1879.4283796701.

The spelling of 6638612838 in words is "six billion, six hundred thirty-eight million, six hundred twelve thousand, eight hundred thirty-eight".