6446720765 has 8 divisors (see below), whose sum is σ = 7787298048. Its totient is φ = 5123221200.

The previous prime is 6446720719. The next prime is 6446720803. The reversal of 6446720765 is 5670276446.

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

It is not a de Polignac number, because 6446720765 - 2⁶ = 6446720701 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 4268597 + ... + 4270106.

It is an arithmetic number, because the mean of its divisors is an integer number (973412256).

Almost surely, 2^6446720765 is an apocalyptic number.

It is an amenable number.

6446720765 is a deficient number, since it is larger than the sum of its proper divisors (1340577283).

6446720765 is a wasteful number, since it uses less digits than its factorization.

6446720765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8538859.

The product of its (nonzero) digits is 1693440, while the sum is 47.

The square root of 6446720765 is about 80291.4738001489. The cubic root of 6446720765 is about 1861.1424712170.

The spelling of 6446720765 in words is "six billion, four hundred forty-six million, seven hundred twenty thousand, seven hundred sixty-five".