7764641 has 2 divisors, whose sum is σ = 7764642. Its totient is φ = 7764640.

The previous prime is 7764613. The next prime is 7764643. The reversal of 7764641 is 1464677.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4857616 + 2907025 = 2204^2 + 1705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7764641 is a prime.

Together with 7764643, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7764643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3882320 + 3882321.

It is an arithmetic number, because the mean of its divisors is an integer number (3882321).

Almost surely, 2^7764641 is an apocalyptic number.

It is an amenable number.

7764641 is a deficient number, since it is larger than the sum of its proper divisors (1).

7764641 is an equidigital number, since it uses as much as digits as its factorization.

7764641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 35.

The square root of 7764641 is about 2786.5105418785. The cubic root of 7764641 is about 198.0191203520.

The spelling of 7764641 in words is "seven million, seven hundred sixty-four thousand, six hundred forty-one".