55781130328 has 128 divisors (see below), whose sum is σ = 138100101120. Its totient is φ = 20477381760.

The previous prime is 55781130311. The next prime is 55781130341. The reversal of 55781130328 is 82303118755.

It is a super-2 number, since 2×55781130328² (a number of 22 digits) contains 22 as substring.

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, 919875 + ... + 978637.

It is an arithmetic number, because the mean of its divisors is an integer number (1078907040).

Almost surely, 2^55781130328 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 55781130328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69050050560).

55781130328 is an abundant number, since it is smaller than the sum of its proper divisors (82318970792).

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

55781130328 is a wasteful number, since it uses less digits than its factorization.

55781130328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58877 (or 58873 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 43.

The spelling of 55781130328 in words is "fifty-five billion, seven hundred eighty-one million, one hundred thirty thousand, three hundred twenty-eight".