55530720 has 216 divisors, whose sum is σ = 220717224. Its totient is φ = 12676608.

The previous prime is 55530719. The next prime is 55530731. The reversal of 55530720 is 2703555.

55530720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 70167 + ... + 70953.

It is an arithmetic number, because the mean of its divisors is an integer number (1021839).

Almost surely, 2^55530720 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 55530720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110358612).

55530720 is an abundant number, since it is smaller than the sum of its proper divisors (165186504).

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

55530720 is a wasteful number, since it uses less digits than its factorization.

55530720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822 (or 804 counting only the distinct ones).

The product of its (nonzero) digits is 5250, while the sum is 27.

The square root of 55530720 is about 7451.8937190489. The cubic root of 55530720 is about 381.5145464812.

The spelling of 55530720 in words is "fifty-five million, five hundred thirty thousand, seven hundred twenty".