77777823448 has 64 divisors (see below), whose sum is σ = 162631022400. Its totient is φ = 34624611840.

The previous prime is 77777823439. The next prime is 77777823463. The reversal of 77777823448 is 84432877777.

It is a self number, because there is not a number n which added to its sum of digits gives 77777823448.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3096990 + ... + 3122002.

It is an arithmetic number, because the mean of its divisors is an integer number (2541109725).

Almost surely, 2^77777823448 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 77777823448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81315511200).

77777823448 is an abundant number, since it is smaller than the sum of its proper divisors (84853198952).

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

77777823448 is a wasteful number, since it uses less digits than its factorization.

77777823448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26092 (or 26088 counting only the distinct ones).

The product of its digits is 103262208, while the sum is 64.

The spelling of 77777823448 in words is "seventy-seven billion, seven hundred seventy-seven million, eight hundred twenty-three thousand, four hundred forty-eight".