77919989056 has 168 divisors, whose sum is σ = 202609460160. Its totient is φ = 29011746816.

The previous prime is 77919989047. The next prime is 77919989071. The reversal of 77919989056 is 65098991977.

It is a super-2 number, since 2×77919989056² (a number of 23 digits) contains 22 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 (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1256835 + ... + 1317373.

Almost surely, 2^77919989056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77919989056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101304730080).

77919989056 is an abundant number, since it is smaller than the sum of its proper divisors (124689471104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77919989056 is a wasteful number, since it uses less digits than its factorization.

77919989056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60601 (or 60578 counting only the distinct ones).

The product of its (nonzero) digits is 77157360, while the sum is 70.

The spelling of 77919989056 in words is "seventy-seven billion, nine hundred nineteen million, nine hundred eighty-nine thousand, fifty-six".