76681729 has 2 divisors, whose sum is σ = 76681730. Its totient is φ = 76681728.

The previous prime is 76681727. The next prime is 76681733. The reversal of 76681729 is 92718667.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71368704 + 5313025 = 8448^2 + 2305^2 .

It is an emirp because it is prime and its reverse (92718667) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76681729 - 2¹ = 76681727 is a prime.

Together with 76681727, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (76681721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38340864 + 38340865.

It is an arithmetic number, because the mean of its divisors is an integer number (38340865).

Almost surely, 2^76681729 is an apocalyptic number.

It is an amenable number.

76681729 is a deficient number, since it is larger than the sum of its proper divisors (1).

76681729 is an equidigital number, since it uses as much as digits as its factorization.

76681729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 46.

The square root of 76681729 is about 8756.8104353126. The cubic root of 76681729 is about 424.8451181888.

The spelling of 76681729 in words is "seventy-six million, six hundred eighty-one thousand, seven hundred twenty-nine".