57781870776 has 128 divisors (see below), whose sum is σ = 183568896000. Its totient is φ = 16497012096.

The previous prime is 57781870753. The next prime is 57781870801. The reversal of 57781870776 is 67707818775.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2162490 + ... + 2189046.

It is an arithmetic number, because the mean of its divisors is an integer number (1434132000).

Almost surely, 2^57781870776 is an apocalyptic number.

57781870776 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 57781870776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91784448000).

57781870776 is an abundant number, since it is smaller than the sum of its proper divisors (125787025224).

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

57781870776 is a wasteful number, since it uses less digits than its factorization.

57781870776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28018 (or 28008 counting only the distinct ones).

The product of its (nonzero) digits is 32269440, while the sum is 63.

The spelling of 57781870776 in words is "fifty-seven billion, seven hundred eighty-one million, eight hundred seventy thousand, seven hundred seventy-six".