77608383929 has 4 divisors (see below), whose sum is σ = 78880652580. Its totient is φ = 76336115280.

The previous prime is 77608383889. The next prime is 77608383961. The reversal of 77608383929 is 92938380677.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92938380677 = 2467 ⋅37672631.

It can be written as a sum of positive squares in 2 ways, for example, as 1667905600 + 75940478329 = 40840^2 + 275573^2 .

It is a cyclic number.

It is not a de Polignac number, because 77608383929 - 2²⁰ = 77607335353 is a prime.

It is a super-2 number, since 2×77608383929² (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 (77607383929) 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 3 ways as a sum of consecutive naturals, for example, 636134234 + ... + 636134355.

It is an arithmetic number, because the mean of its divisors is an integer number (19720163145).

Almost surely, 2^77608383929 is an apocalyptic number.

It is an amenable number.

77608383929 is a deficient number, since it is larger than the sum of its proper divisors (1272268651).

77608383929 is a wasteful number, since it uses less digits than its factorization.

77608383929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1272268650.

The product of its (nonzero) digits is 27433728, while the sum is 62.

The spelling of 77608383929 in words is "seventy-seven billion, six hundred eight million, three hundred eighty-three thousand, nine hundred twenty-nine".