6438406788 has 36 divisors (see below), whose sum is σ = 17754395568. Its totient is φ = 1951032240.

The previous prime is 6438406781. The next prime is 6438406811. The reversal of 6438406788 is 8876048346.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (6438406781) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8128906 + ... + 8129697.

Almost surely, 2^6438406788 is an apocalyptic number.

It is an amenable number.

6438406788 is an abundant number, since it is smaller than the sum of its proper divisors (11315988780).

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

6438406788 is a wasteful number, since it uses less digits than its factorization.

6438406788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16258624 (or 16258619 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 54.

The square root of 6438406788 is about 80239.6833742507. The cubic root of 6438406788 is about 1860.3420564117.

The spelling of 6438406788 in words is "six billion, four hundred thirty-eight million, four hundred six thousand, seven hundred eighty-eight".