6400071816 has 64 divisors (see below), whose sum is σ = 17010933120. Its totient is φ = 2002091520.

The previous prime is 6400071809. The next prime is 6400071829. The reversal of 6400071816 is 6181700046.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80125 + ... + 138636.

It is an arithmetic number, because the mean of its divisors is an integer number (265795830).

Almost surely, 2^6400071816 is an apocalyptic number.

It is an amenable number.

6400071816 is an abundant number, since it is smaller than the sum of its proper divisors (10610861304).

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

6400071816 is a wasteful number, since it uses less digits than its factorization.

6400071816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218846 (or 218842 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 6400071816 is about 80000.4488487408. The cubic root of 6400071816 is about 1856.6424780096.

The spelling of 6400071816 in words is "six billion, four hundred million, seventy-one thousand, eight hundred sixteen".