77256134220 has 96 divisors (see below), whose sum is σ = 219560140800. Its totient is φ = 20294841600.

The previous prime is 77256134201. The next prime is 77256134261. The reversal of 77256134220 is 2243165277.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1173909 + ... + 1237971.

It is an arithmetic number, because the mean of its divisors is an integer number (2287084800).

Almost surely, 2^77256134220 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 77256134220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109780070400).

77256134220 is an abundant number, since it is smaller than the sum of its proper divisors (142304006580).

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

77256134220 is a wasteful number, since it uses less digits than its factorization.

77256134220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64375 (or 64373 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 39.

Adding to 77256134220 its reverse (2243165277), we get a palindrome (79499299497).

The spelling of 77256134220 in words is "seventy-seven billion, two hundred fifty-six million, one hundred thirty-four thousand, two hundred twenty".