55220616 has 160 divisors (see below), whose sum is σ = 172846080. Its totient is φ = 16329600.

The previous prime is 55220597. The next prime is 55220617. The reversal of 55220616 is 61602255.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 55220616.

It is not an unprimeable number, because it can be changed into a prime (55220617) by changing a digit.

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 39 ways as a sum of consecutive naturals, for example, 434745 + ... + 434871.

It is an arithmetic number, because the mean of its divisors is an integer number (1080288).

Almost surely, 2^55220616 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 55220616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86423040).

55220616 is an abundant number, since it is smaller than the sum of its proper divisors (117625464).

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

55220616 is a wasteful number, since it uses less digits than its factorization.

55220616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217 (or 204 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 55220616 is about 7431.0575290466. The cubic root of 55220616 is about 380.8030478124.

The spelling of 55220616 in words is "fifty-five million, two hundred twenty thousand, six hundred sixteen".