6400088705 has 4 divisors (see below), whose sum is σ = 7680106452. Its totient is φ = 5120070960.

The previous prime is 6400088683. The next prime is 6400088711. The reversal of 6400088705 is 5078800046.

6400088705 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1578313984 + 4821774721 = 39728^2 + 69439^2 .

It is not a de Polignac number, because 6400088705 - 2²⁰ = 6399040129 is a prime.

It is a super-2 number, since 2×6400088705² = 81922270863737154050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 640008866 + ... + 640008875.

It is an arithmetic number, because the mean of its divisors is an integer number (1920026613).

Almost surely, 2^6400088705 is an apocalyptic number.

It is an amenable number.

6400088705 is a deficient number, since it is larger than the sum of its proper divisors (1280017747).

6400088705 is a wasteful number, since it uses less digits than its factorization.

6400088705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280017746.

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 6400088705 is about 80000.5544043290. The cubic root of 6400088705 is about 1856.6441111583.

The spelling of 6400088705 in words is "six billion, four hundred million, eighty-eight thousand, seven hundred five".