765780481 has 4 divisors (see below), whose sum is σ = 772806100. Its totient is φ = 758754864.

The previous prime is 765780451. The next prime is 765780539. The reversal of 765780481 is 184087567.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 184087567 = 367 ⋅501601.

It can be written as a sum of positive squares in 2 ways, for example, as 224520256 + 541260225 = 14984^2 + 23265^2 .

It is a cyclic number.

It is not a de Polignac number, because 765780481 - 2⁹ = 765779969 is a prime.

It is a super-2 number, since 2×765780481² = 1172839490161182722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (765780451) 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, 3512646 + ... + 3512863.

It is an arithmetic number, because the mean of its divisors is an integer number (193201525).

Almost surely, 2^765780481 is an apocalyptic number.

It is an amenable number.

765780481 is a deficient number, since it is larger than the sum of its proper divisors (7025619).

765780481 is a wasteful number, since it uses less digits than its factorization.

765780481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7025618.

The product of its (nonzero) digits is 376320, while the sum is 46.

The square root of 765780481 is about 27672.7389500931. The cubic root of 765780481 is about 914.8883501182. Note that the first 3 decimals are identical.

The spelling of 765780481 in words is "seven hundred sixty-five million, seven hundred eighty thousand, four hundred eighty-one".