76644521 has 2 divisors, whose sum is σ = 76644522. Its totient is φ = 76644520.

The previous prime is 76644511. The next prime is 76644527. The reversal of 76644521 is 12544667.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69488896 + 7155625 = 8336^2 + 2675^2 .

It is an emirp because it is prime and its reverse (12544667) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76644521 - 2¹⁴ = 76628137 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (76644527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38322260 + 38322261.

It is an arithmetic number, because the mean of its divisors is an integer number (38322261).

Almost surely, 2^76644521 is an apocalyptic number.

It is an amenable number.

76644521 is a deficient number, since it is larger than the sum of its proper divisors (1).

76644521 is an equidigital number, since it uses as much as digits as its factorization.

76644521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 35.

The square root of 76644521 is about 8754.6856596910. The cubic root of 76644521 is about 424.7763917146.

The spelling of 76644521 in words is "seventy-six million, six hundred forty-four thousand, five hundred twenty-one".