77647254256 has 80 divisors (see below), whose sum is σ = 176823370080. Its totient is φ = 32564367360.

The previous prime is 77647254253. The next prime is 77647254301. The reversal of 77647254256 is 65245274677.

It is a super-2 number, since 2×77647254256² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77647254197 and 77647254206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77647254253) 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, 6017860 + ... + 6030748.

It is an arithmetic number, because the mean of its divisors is an integer number (2210292126).

Almost surely, 2^77647254256 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 77647254256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88411685040).

77647254256 is an abundant number, since it is smaller than the sum of its proper divisors (99176115824).

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

77647254256 is a wasteful number, since it uses less digits than its factorization.

77647254256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15554 (or 15548 counting only the distinct ones).

The product of its digits is 19756800, while the sum is 55.

The spelling of 77647254256 in words is "seventy-seven billion, six hundred forty-seven million, two hundred fifty-four thousand, two hundred fifty-six".