6467940209 has 8 divisors (see below), whose sum is σ = 6752361000. Its totient is φ = 6187612032.

The previous prime is 6467940197. The next prime is 6467940263. The reversal of 6467940209 is 9020497646.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 472845025 + 5995095184 = 21745^2 + 77428^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6467940209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6467940299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1019924 + ... + 1026245.

It is an arithmetic number, because the mean of its divisors is an integer number (844045125).

Almost surely, 2^6467940209 is an apocalyptic number.

It is an amenable number.

6467940209 is a deficient number, since it is larger than the sum of its proper divisors (284420791).

6467940209 is a wasteful number, since it uses less digits than its factorization.

6467940209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2046307.

The product of its (nonzero) digits is 653184, while the sum is 47.

The square root of 6467940209 is about 80423.5053264902. The cubic root of 6467940209 is about 1863.1822244011.

The spelling of 6467940209 in words is "six billion, four hundred sixty-seven million, nine hundred forty thousand, two hundred nine".