77996885972 has 24 divisors (see below), whose sum is σ = 144676373184. Its totient is φ = 36665628032.

The previous prime is 77996885969. The next prime is 77996885983. The reversal of 77996885972 is 27958869977.

It is a junction number, because it is equal to n+sod(n) for n = 77996885893 and 77996885902.

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 7 ways as a sum of consecutive naturals, for example, 541208 + ... + 669999.

It is an arithmetic number, because the mean of its divisors is an integer number (6028182216).

Almost surely, 2^77996885972 is an apocalyptic number.

It is an amenable number.

77996885972 is a deficient number, since it is larger than the sum of its proper divisors (66679487212).

77996885972 is a wasteful number, since it uses less digits than its factorization.

77996885972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212175 (or 1212173 counting only the distinct ones).

The product of its digits is 960180480, while the sum is 77.

The spelling of 77996885972 in words is "seventy-seven billion, nine hundred ninety-six million, eight hundred eighty-five thousand, nine hundred seventy-two".