766609 has 2 divisors, whose sum is σ = 766610. Its totient is φ = 766608.

The previous prime is 766583. The next prime is 766637. The reversal of 766609 is 906667.

766609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 705600 + 61009 = 840^2 + 247^2 .

It is a cyclic number.

It is not a de Polignac number, because 766609 - 2⁹ = 766097 is a prime.

It is not a weakly prime, because it can be changed into another prime (766639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 383304 + 383305.

It is an arithmetic number, because the mean of its divisors is an integer number (383305).

2⁷⁶⁶⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

766609 is a deficient number, since it is larger than the sum of its proper divisors (1).

766609 is an equidigital number, since it uses as much as digits as its factorization.

766609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 766609 is about 875.5621051644. The cubic root of 766609 is about 91.5218178834.

The spelling of 766609 in words is "seven hundred sixty-six thousand, six hundred nine".