55561688 has 48 divisors (see below), whose sum is σ = 130520880. Its totient is φ = 21978432.

The previous prime is 55561669. The next prime is 55561691. The reversal of 55561688 is 88616555.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 356 + ... + 10547.

It is an arithmetic number, because the mean of its divisors is an integer number (2719185).

Almost surely, 2^55561688 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 55561688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65260440).

55561688 is an abundant number, since it is smaller than the sum of its proper divisors (74959192).

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

55561688 is a wasteful number, since it uses less digits than its factorization.

55561688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10936 (or 10925 counting only the distinct ones).

The product of its digits is 288000, while the sum is 44.

The square root of 55561688 is about 7453.9712905269. The cubic root of 55561688 is about 381.5854534609.

The spelling of 55561688 in words is "fifty-five million, five hundred sixty-one thousand, six hundred eighty-eight".