6440761 has 4 divisors (see below), whose sum is σ = 6448000. Its totient is φ = 6433524.

The previous prime is 6440747. The next prime is 6440771. The reversal of 6440761 is 1670446.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6440761 - 2⁹ = 6440249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6440771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2061 + ... + 4138.

It is an arithmetic number, because the mean of its divisors is an integer number (1612000).

Almost surely, 2^6440761 is an apocalyptic number.

It is an amenable number.

6440761 is a deficient number, since it is larger than the sum of its proper divisors (7239).

6440761 is a wasteful number, since it uses less digits than its factorization.

6440761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7238.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 6440761 is about 2537.8654416655. The cubic root of 6440761 is about 186.0568774296.

The spelling of 6440761 in words is "six million, four hundred forty thousand, seven hundred sixty-one".