55147091328 has 640 divisors, whose sum is σ = 197061258240. Its totient is φ = 14979686400.

The previous prime is 55147091323. The next prime is 55147091359. The reversal of 55147091328 is 82319074155.

55147091328 is a `hidden beast` number, since 551 + 4 + 7 + 0 + 91 + 3 + 2 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55147091323) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 127951273 + ... + 127951703.

It is an arithmetic number, because the mean of its divisors is an integer number (307908216).

Almost surely, 2^55147091328 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 55147091328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98530629120).

55147091328 is an abundant number, since it is smaller than the sum of its proper divisors (141914166912).

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

55147091328 is a wasteful number, since it uses less digits than its factorization.

55147091328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548 (or 527 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The spelling of 55147091328 in words is "fifty-five billion, one hundred forty-seven million, ninety-one thousand, three hundred twenty-eight".