6440765 has 8 divisors (see below), whose sum is σ = 7838208. Its totient is φ = 5079760.

The previous prime is 6440747. The next prime is 6440771. The reversal of 6440765 is 5670446.

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

It is not a de Polignac number, because 6440765 - 2¹⁴ = 6424381 is a prime.

It is a Duffinian 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, 8717 + ... + 9426.

It is an arithmetic number, because the mean of its divisors is an integer number (979776).

Almost surely, 2^6440765 is an apocalyptic number.

It is an amenable number.

6440765 is a deficient number, since it is larger than the sum of its proper divisors (1397443).

6440765 is a wasteful number, since it uses less digits than its factorization.

6440765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18219.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 6440765 is about 2537.8662297292. The cubic root of 6440765 is about 186.0569159461.

The spelling of 6440765 in words is "six million, four hundred forty thousand, seven hundred sixty-five".