764625238369 has 4 divisors (see below), whose sum is σ = 764648199700. Its totient is φ = 764602277040.

The previous prime is 764625238331. The next prime is 764625238373. The reversal of 764625238369 is 963832526467.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 963832526467 = 139 ⋅6934046953.

It can be written as a sum of positive squares in 2 ways, for example, as 640096003600 + 124529234769 = 800060^2 + 352887^2 .

It is a cyclic number.

It is not a de Polignac number, because 764625238369 - 2¹¹ = 764625236321 is a prime.

It is a super-2 number, since 2×764625238369² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (764625238469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11430642 + ... + 11497339.

It is an arithmetic number, because the mean of its divisors is an integer number (191162049925).

Almost surely, 2^764625238369 is an apocalyptic number.

It is an amenable number.

764625238369 is a deficient number, since it is larger than the sum of its proper divisors (22961331).

764625238369 is a wasteful number, since it uses less digits than its factorization.

764625238369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22961330.

The product of its digits is 78382080, while the sum is 61.

The spelling of 764625238369 in words is "seven hundred sixty-four billion, six hundred twenty-five million, two hundred thirty-eight thousand, three hundred sixty-nine".