55128779328 has 224 divisors, whose sum is σ = 168171798784. Its totient is φ = 15612715008.

The previous prime is 55128779323. The next prime is 55128779347. The reversal of 55128779328 is 82397782155.

55128779328 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (224).

It is not an unprimeable number, because it can be changed into a prime (55128779323) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 138863226 + ... + 138863622.

Almost surely, 2^55128779328 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 55128779328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84085899392).

55128779328 is an abundant number, since it is smaller than the sum of its proper divisors (113043019456).

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

55128779328 is a wasteful number, since it uses less digits than its factorization.

55128779328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069 (or 1059 counting only the distinct ones).

The product of its digits is 8467200, while the sum is 57.

The spelling of 55128779328 in words is "fifty-five billion, one hundred twenty-eight million, seven hundred seventy-nine thousand, three hundred twenty-eight".