76508681 has 2 divisors, whose sum is σ = 76508682. Its totient is φ = 76508680.

The previous prime is 76508647. The next prime is 76508743. The reversal of 76508681 is 18680567.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58369600 + 18139081 = 7640^2 + 4259^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-76508681 is a prime.

It is a super-2 number, since 2×76508681² = 11707156536719522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (76508581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38254340 + 38254341.

It is an arithmetic number, because the mean of its divisors is an integer number (38254341).

Almost surely, 2^76508681 is an apocalyptic number.

It is an amenable number.

76508681 is a deficient number, since it is larger than the sum of its proper divisors (1).

76508681 is an equidigital number, since it uses as much as digits as its factorization.

76508681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 76508681 is about 8746.9240879294. The cubic root of 76508681 is about 424.5252941939.

The spelling of 76508681 in words is "seventy-six million, five hundred eight thousand, six hundred eighty-one".