6404640206 has 8 divisors (see below), whose sum is σ = 9608224584. Its totient is φ = 3201898680.

The previous prime is 6404640127. The next prime is 6404640247. The reversal of 6404640206 is 6020464046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent 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, 191360 + ... + 222323.

It is an arithmetic number, because the mean of its divisors is an integer number (1201028073).

Almost surely, 2^6404640206 is an apocalyptic number.

6404640206 is a deficient number, since it is larger than the sum of its proper divisors (3203584378).

6404640206 is a wasteful number, since it uses less digits than its factorization.

6404640206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421426.

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 6404640206 is about 80028.9960326881. The cubic root of 6404640206 is about 1857.0841318872.

The spelling of 6404640206 in words is "six billion, four hundred four million, six hundred forty thousand, two hundred six".