76687720817 has 8 divisors (see below), whose sum is σ = 81547259976. Its totient is φ = 71866903552.

The previous prime is 76687720757. The next prime is 76687720841. The reversal of 76687720817 is 71802778667.

It can be written as a sum of positive squares in 4 ways, for example, as 16349202496 + 60338518321 = 127864^2 + 245639^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 76687720817 - 2¹⁶ = 76687655281 is a prime.

It is a super-2 number, since 2×76687720817² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76687720847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9676388 + ... + 9684309.

It is an arithmetic number, because the mean of its divisors is an integer number (10193407497).

Almost surely, 2^76687720817 is an apocalyptic number.

It is an amenable number.

76687720817 is a deficient number, since it is larger than the sum of its proper divisors (4859539159).

76687720817 is a wasteful number, since it uses less digits than its factorization.

76687720817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19360947.

The product of its (nonzero) digits is 11063808, while the sum is 59.

The spelling of 76687720817 in words is "seventy-six billion, six hundred eighty-seven million, seven hundred twenty thousand, eight hundred seventeen".