55128332 has 48 divisors (see below), whose sum is σ = 117465600. Its totient is φ = 22586256.

The previous prime is 55128317. The next prime is 55128341. The reversal of 55128332 is 23382155.

It is a junction number, because it is equal to n+sod(n) for n = 55128295 and 55128304.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30683 + ... + 32429.

It is an arithmetic number, because the mean of its divisors is an integer number (2447200).

Almost surely, 2^55128332 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 55128332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58732800).

55128332 is an abundant number, since it is smaller than the sum of its proper divisors (62337268).

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

55128332 is a wasteful number, since it uses less digits than its factorization.

55128332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1795 (or 1779 counting only the distinct ones).

The product of its digits is 7200, while the sum is 29.

The square root of 55128332 is about 7424.8455876200. The cubic root of 55128332 is about 380.5907984418.

The spelling of 55128332 in words is "fifty-five million, one hundred twenty-eight thousand, three hundred thirty-two".