76788521 has 2 divisors, whose sum is σ = 76788522. Its totient is φ = 76788520.

The previous prime is 76788493. The next prime is 76788527. The reversal of 76788521 is 12588767.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74995600 + 1792921 = 8660^2 + 1339^2 .

It is an emirp because it is prime and its reverse (12588767) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76788521 - 2²² = 72594217 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (76788527) 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, 38394260 + 38394261.

It is an arithmetic number, because the mean of its divisors is an integer number (38394261).

Almost surely, 2^76788521 is an apocalyptic number.

It is an amenable number.

76788521 is a deficient number, since it is larger than the sum of its proper divisors (1).

76788521 is an equidigital number, since it uses as much as digits as its factorization.

76788521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 188160, while the sum is 44.

The square root of 76788521 is about 8762.9059677712. The cubic root of 76788521 is about 425.0422490871.

The spelling of 76788521 in words is "seventy-six million, seven hundred eighty-eight thousand, five hundred twenty-one".