55128736 has 48 divisors (see below), whose sum is σ = 118276200. Its totient is φ = 25141248.

The previous prime is 55128727. The next prime is 55128751. The reversal of 55128736 is 63782155.

It can be written as a sum of positive squares in 4 ways, for example, as 20976400 + 34152336 = 4580^2 + 5844^2 .

It is a junction number, because it is equal to n+sod(n) for n = 55128695 and 55128704.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36280 + ... + 37768.

Almost surely, 2^55128736 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 55128736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59138100).

55128736 is an abundant number, since it is smaller than the sum of its proper divisors (63147464).

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

55128736 is a wasteful number, since it uses less digits than its factorization.

55128736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1601 (or 1593 counting only the distinct ones).

The product of its digits is 50400, while the sum is 37.

The square root of 55128736 is about 7424.8727935231. The cubic root of 55128736 is about 380.5917281411.

The spelling of 55128736 in words is "fifty-five million, one hundred twenty-eight thousand, seven hundred thirty-six".