77969378768 has 20 divisors (see below), whose sum is σ = 151344922308. Its totient is φ = 38912624640.

The previous prime is 77969378737. The next prime is 77969378771. The reversal of 77969378768 is 86787396977.

It can be written as a sum of positive squares in 2 ways, for example, as 42688518544 + 35280860224 = 206612^2 + 187832^2 .

It is a super-3 number, since 3×77969378768³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4495121 + ... + 4512432.

Almost surely, 2^77969378768 is an apocalyptic number.

It is an amenable number.

77969378768 is a deficient number, since it is larger than the sum of its proper divisors (73375543540).

77969378768 is a wasteful number, since it uses less digits than its factorization.

77969378768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9008102 (or 9008096 counting only the distinct ones).

The product of its digits is 1344252672, while the sum is 77.

The spelling of 77969378768 in words is "seventy-seven billion, nine hundred sixty-nine million, three hundred seventy-eight thousand, seven hundred sixty-eight".