7644406765 has 4 divisors (see below), whose sum is σ = 9173288124. Its totient is φ = 6115525408.

The previous prime is 7644406747. The next prime is 7644406789. The reversal of 7644406765 is 5676044467.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1342269769 + 6302136996 = 36637^2 + 79386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7644406765 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 764440672 + ... + 764440681.

It is an arithmetic number, because the mean of its divisors is an integer number (2293322031).

Almost surely, 2^7644406765 is an apocalyptic number.

It is an amenable number.

7644406765 is a deficient number, since it is larger than the sum of its proper divisors (1528881359).

7644406765 is a wasteful number, since it uses less digits than its factorization.

7644406765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1528881358.

The product of its (nonzero) digits is 3386880, while the sum is 49.

The square root of 7644406765 is about 87432.2981797917. The cubic root of 7644406765 is about 1969.9170058743.

The spelling of 7644406765 in words is "seven billion, six hundred forty-four million, four hundred six thousand, seven hundred sixty-five".