764308645 has 8 divisors (see below), whose sum is σ = 917402904. Its totient is φ = 611291904.

The previous prime is 764308631. The next prime is 764308673. The reversal of 764308645 is 546803467.

It can be written as a sum of positive squares in 4 ways, for example, as 320911396 + 443397249 = 17914^2 + 21057^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-764308645 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5137 + ... + 39433.

It is an arithmetic number, because the mean of its divisors is an integer number (114675363).

Almost surely, 2^764308645 is an apocalyptic number.

It is an amenable number.

764308645 is a deficient number, since it is larger than the sum of its proper divisors (153094259).

764308645 is a wasteful number, since it uses less digits than its factorization.

764308645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38759.

The product of its (nonzero) digits is 483840, while the sum is 43.

The square root of 764308645 is about 27646.1325505033. The cubic root of 764308645 is about 914.3018333689.

The spelling of 764308645 in words is "seven hundred sixty-four million, three hundred eight thousand, six hundred forty-five".