77562872856 has 96 divisors (see below), whose sum is σ = 240234758400. Its totient is φ = 22146125760.

The previous prime is 77562872839. The next prime is 77562872879. The reversal of 77562872856 is 65827826577.

77562872856 is a `hidden beast` number, since 7 + 75 + 6 + 287 + 285 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 77562872793 and 77562872802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 721365 + ... + 821883.

It is an arithmetic number, because the mean of its divisors is an integer number (2502445400).

Almost surely, 2^77562872856 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 77562872856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120117379200).

77562872856 is an abundant number, since it is smaller than the sum of its proper divisors (162671885544).

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

77562872856 is a wasteful number, since it uses less digits than its factorization.

77562872856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102069 (or 102062 counting only the distinct ones).

The product of its digits is 79027200, while the sum is 63.

The spelling of 77562872856 in words is "seventy-seven billion, five hundred sixty-two million, eight hundred seventy-two thousand, eight hundred fifty-six".