764591617 has 4 divisors (see below), whose sum is σ = 765380016. Its totient is φ = 763803220.

The previous prime is 764591593. The next prime is 764591623. The reversal of 764591617 is 716195467.

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.

It is a cyclic number.

It is not a de Polignac number, because 764591617 - 2²³ = 756203009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (764591647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 392743 + ... + 394684.

It is an arithmetic number, because the mean of its divisors is an integer number (191345004).

Almost surely, 2^764591617 is an apocalyptic number.

It is an amenable number.

764591617 is a deficient number, since it is larger than the sum of its proper divisors (788399).

764591617 is an equidigital number, since it uses as much as digits as its factorization.

764591617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788398.

The product of its digits is 317520, while the sum is 46.

The square root of 764591617 is about 27651.2498270874. The cubic root of 764591617 is about 914.4146542376.

The spelling of 764591617 in words is "seven hundred sixty-four million, five hundred ninety-one thousand, six hundred seventeen".