76308821 has 2 divisors, whose sum is σ = 76308822. Its totient is φ = 76308820.

The previous prime is 76308811. The next prime is 76308823. The reversal of 76308821 is 12880367.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69072721 + 7236100 = 8311^2 + 2690^2 .

It is a cyclic number.

It is not a de Polignac number, because 76308821 - 2¹⁰ = 76307797 is a prime.

It is a super-3 number, since 3×76308821³ (a number of 25 digits) contains 333 as substring.

It is a Sophie Germain prime.

Together with 76308823, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76308823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38154410 + 38154411.

It is an arithmetic number, because the mean of its divisors is an integer number (38154411).

Almost surely, 2^76308821 is an apocalyptic number.

It is an amenable number.

76308821 is a deficient number, since it is larger than the sum of its proper divisors (1).

76308821 is an equidigital number, since it uses as much as digits as its factorization.

76308821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 76308821 is about 8735.4920296455. The cubic root of 76308821 is about 424.1553160817.

The spelling of 76308821 in words is "seventy-six million, three hundred eight thousand, eight hundred twenty-one".