76739521 has 2 divisors, whose sum is σ = 76739522. Its totient is φ = 76739520.

The previous prime is 76739519. The next prime is 76739527. The reversal of 76739521 is 12593767.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70308225 + 6431296 = 8385^2 + 2536^2 .

It is a cyclic number.

It is not a de Polignac number, because 76739521 - 2¹ = 76739519 is a prime.

Together with 76739519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (76739527) 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, 38369760 + 38369761.

It is an arithmetic number, because the mean of its divisors is an integer number (38369761).

Almost surely, 2^76739521 is an apocalyptic number.

It is an amenable number.

76739521 is a deficient number, since it is larger than the sum of its proper divisors (1).

76739521 is an equidigital number, since it uses as much as digits as its factorization.

76739521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 79380, while the sum is 40.

The square root of 76739521 is about 8760.1096454325. The cubic root of 76739521 is about 424.9518210668.

The spelling of 76739521 in words is "seventy-six million, seven hundred thirty-nine thousand, five hundred twenty-one".