55545588 has 120 divisors (see below), whose sum is σ = 174820800. Its totient is φ = 15023232.

The previous prime is 55545577. The next prime is 55545601. The reversal of 55545588 is 88554555.

55545588 is a `hidden beast` number, since 55 + 545 + 58 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 42448 + ... + 43736.

It is an arithmetic number, because the mean of its divisors is an integer number (1456840).

Almost surely, 2^55545588 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 55545588, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87410400).

55545588 is an abundant number, since it is smaller than the sum of its proper divisors (119275212).

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

55545588 is a wasteful number, since it uses less digits than its factorization.

55545588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331 (or 1320 counting only the distinct ones).

The product of its digits is 800000, while the sum is 45.

The square root of 55545588 is about 7452.8912510515. The cubic root of 55545588 is about 381.5485928139.

The spelling of 55545588 in words is "fifty-five million, five hundred forty-five thousand, five hundred eighty-eight".