764421673 has 4 divisors (see below), whose sum is σ = 765367380. Its totient is φ = 763475968.

The previous prime is 764421659. The next prime is 764421719. The reversal of 764421673 is 376124467.

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 338081769 + 426339904 = 18387^2 + 20648^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-764421673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (764421613) 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, 471640 + ... + 473257.

It is an arithmetic number, because the mean of its divisors is an integer number (191341845).

Almost surely, 2^764421673 is an apocalyptic number.

It is an amenable number.

764421673 is a deficient number, since it is larger than the sum of its proper divisors (945707).

764421673 is an equidigital number, since it uses as much as digits as its factorization.

764421673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945706.

The product of its digits is 169344, while the sum is 40.

The square root of 764421673 is about 27648.1766668256. The cubic root of 764421673 is about 914.3469009449.

The spelling of 764421673 in words is "seven hundred sixty-four million, four hundred twenty-one thousand, six hundred seventy-three".