77988563972 has 48 divisors (see below), whose sum is σ = 150487593984. Its totient is φ = 35069028000.

The previous prime is 77988563971. The next prime is 77988564019. The reversal of 77988563972 is 27936588977.

It is a super-2 number, since 2×77988563972² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77988563896 and 77988563905.

It is not an unprimeable number, because it can be changed into a prime (77988563971) 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 in 15 ways as a sum of consecutive naturals, for example, 4664147 + ... + 4680837.

It is an arithmetic number, because the mean of its divisors is an integer number (3135158208).

Almost surely, 2^77988563972 is an apocalyptic number.

It is an amenable number.

77988563972 is a deficient number, since it is larger than the sum of its proper divisors (72499030012).

77988563972 is a wasteful number, since it uses less digits than its factorization.

77988563972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17840 (or 17838 counting only the distinct ones).

The product of its digits is 320060160, while the sum is 71.

The spelling of 77988563972 in words is "seventy-seven billion, nine hundred eighty-eight million, five hundred sixty-three thousand, nine hundred seventy-two".