55131888 has 160 divisors (see below), whose sum is σ = 172687360. Its totient is φ = 14826240.

The previous prime is 55131859. The next prime is 55131889. The reversal of 55131888 is 88813155.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55131889) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 697833 + ... + 697911.

It is an arithmetic number, because the mean of its divisors is an integer number (1079296).

Almost surely, 2^55131888 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 55131888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86343680).

55131888 is an abundant number, since it is smaller than the sum of its proper divisors (117555472).

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

55131888 is a wasteful number, since it uses less digits than its factorization.

55131888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195 (or 189 counting only the distinct ones).

The product of its digits is 38400, while the sum is 39.

The square root of 55131888 is about 7425.0850500179. The cubic root of 55131888 is about 380.5989814803.

The spelling of 55131888 in words is "fifty-five million, one hundred thirty-one thousand, eight hundred eighty-eight".