55573128 has 112 divisors (see below), whose sum is σ = 168475020. Its totient is φ = 17076096.

The previous prime is 55573127. The next prime is 55573139. The reversal of 55573128 is 82137555.

It can be written as a sum of positive squares in 2 ways, for example, as 54730404 + 842724 = 7398^2 + 918^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 55573092 and 55573101.

It is not an unprimeable number, because it can be changed into a prime (55573121) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 75450 + ... + 76182.

Almost surely, 2^55573128 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 55573128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84237510).

55573128 is an abundant number, since it is smaller than the sum of its proper divisors (112901892).

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

55573128 is a wasteful number, since it uses less digits than its factorization.

55573128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770 (or 751 counting only the distinct ones).

The product of its digits is 42000, while the sum is 36.

The square root of 55573128 is about 7454.7386272089. The cubic root of 55573128 is about 381.6116407983.

The spelling of 55573128 in words is "fifty-five million, five hundred seventy-three thousand, one hundred twenty-eight".