76837721 has 2 divisors, whose sum is σ = 76837722. Its totient is φ = 76837720.

The previous prime is 76837699. The next prime is 76837723. The reversal of 76837721 is 12773867.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59290000 + 17547721 = 7700^2 + 4189^2 .

It is an emirp because it is prime and its reverse (12773867) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76837721 - 2¹⁴ = 76821337 is a prime.

Together with 76837723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (76837723) 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, 38418860 + 38418861.

It is an arithmetic number, because the mean of its divisors is an integer number (38418861).

Almost surely, 2^76837721 is an apocalyptic number.

It is an amenable number.

76837721 is a deficient number, since it is larger than the sum of its proper divisors (1).

76837721 is an equidigital number, since it uses as much as digits as its factorization.

76837721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 98784, while the sum is 41.

The square root of 76837721 is about 8765.7128061556. The cubic root of 76837721 is about 425.1330075047.

The spelling of 76837721 in words is "seventy-six million, eight hundred thirty-seven thousand, seven hundred twenty-one".