765378241 has 4 divisors (see below), whose sum is σ = 765442132. Its totient is φ = 765314352.

The previous prime is 765378239. The next prime is 765378253. The reversal of 765378241 is 142873567.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 142873567 = 149 ⋅958883.

It can be written as a sum of positive squares in 2 ways, for example, as 312582400 + 452795841 = 17680^2 + 21279^2 .

It is a 3-Lehmer number, since φ(765378241) divides (765378241-1)³.

It is a cyclic number.

It is not a de Polignac number, because 765378241 - 2¹ = 765378239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (765378281) 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, 7986 + ... + 39931.

It is an arithmetic number, because the mean of its divisors is an integer number (191360533).

It is a Poulet number, since it divides 2^765378240-1.

Almost surely, 2^765378241 is an apocalyptic number.

765378241 is the 15973-rd octagonal number.

It is an amenable number.

765378241 is a deficient number, since it is larger than the sum of its proper divisors (63891).

765378241 is a wasteful number, since it uses less digits than its factorization.

765378241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63890.

The product of its digits is 282240, while the sum is 43.

The square root of 765378241 is about 27665.4701930041. The cubic root of 765378241 is about 914.7281348643.

The spelling of 765378241 in words is "seven hundred sixty-five million, three hundred seventy-eight thousand, two hundred forty-one".