55216560 has 160 divisors (see below), whose sum is σ = 204272640. Its totient is φ = 12063744.

The previous prime is 55216559. The next prime is 55216591. The reversal of 55216560 is 6561255.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37926 + ... + 39354.

It is an arithmetic number, because the mean of its divisors is an integer number (1276704).

Almost surely, 2^55216560 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 55216560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102136320).

55216560 is an abundant number, since it is smaller than the sum of its proper divisors (149056080).

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

55216560 is a wasteful number, since it uses less digits than its factorization.

55216560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1475 (or 1469 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 55216560 is about 7430.7846153687. The cubic root of 55216560 is about 380.7937241510.

The spelling of 55216560 in words is "fifty-five million, two hundred sixteen thousand, five hundred sixty".