766789381 has 2 divisors, whose sum is σ = 766789382. Its totient is φ = 766789380.

The previous prime is 766789367. The next prime is 766789391. The reversal of 766789381 is 183987667.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 662238756 + 104550625 = 25734^2 + 10225^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-766789381 is a prime.

It is a super-2 number, since 2×766789381² = 1175931909628726322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (766789321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 383394690 + 383394691.

It is an arithmetic number, because the mean of its divisors is an integer number (383394691).

Almost surely, 2^766789381 is an apocalyptic number.

It is an amenable number.

766789381 is a deficient number, since it is larger than the sum of its proper divisors (1).

766789381 is an equidigital number, since it uses as much as digits as its factorization.

766789381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3048192, while the sum is 55.

The square root of 766789381 is about 27690.9620815168. The cubic root of 766789381 is about 915.2899559820.

The spelling of 766789381 in words is "seven hundred sixty-six million, seven hundred eighty-nine thousand, three hundred eighty-one".