81768763 has 2 divisors, whose sum is σ = 81768764. Its totient is φ = 81768762.

The previous prime is 81768727. The next prime is 81768781. The reversal of 81768763 is 36786718.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81768763 - 2¹³ = 81760571 is a prime.

It is a super-2 number, since 2×81768763² = 13372261205100338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81768163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40884381 + 40884382.

It is an arithmetic number, because the mean of its divisors is an integer number (40884382).

Almost surely, 2^81768763 is an apocalyptic number.

81768763 is a deficient number, since it is larger than the sum of its proper divisors (1).

81768763 is an equidigital number, since it uses as much as digits as its factorization.

81768763 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 46.

The square root of 81768763 is about 9042.6081967539. The cubic root of 81768763 is about 434.0393881444.

The spelling of 81768763 in words is "eighty-one million, seven hundred sixty-eight thousand, seven hundred sixty-three".