55505272728 has 32 divisors (see below), whose sum is σ = 141990235200. Its totient is φ = 18071483808.

The previous prime is 55505272727. The next prime is 55505272747. The reversal of 55505272728 is 82727250555.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55505272727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26891058 + ... + 26893121.

It is an arithmetic number, because the mean of its divisors is an integer number (4437194850).

Almost surely, 2^55505272728 is an apocalyptic number.

It is an amenable number.

55505272728 is an abundant number, since it is smaller than the sum of its proper divisors (86484962472).

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

55505272728 is a wasteful number, since it uses less digits than its factorization.

55505272728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53784231 (or 53784227 counting only the distinct ones).

The product of its (nonzero) digits is 1960000, while the sum is 48.

The spelling of 55505272728 in words is "fifty-five billion, five hundred five million, two hundred seventy-two thousand, seven hundred twenty-eight".