55589220 has 96 divisors (see below), whose sum is σ = 174666240. Its totient is φ = 14676480.

The previous prime is 55589197. The next prime is 55589227. The reversal of 55589220 is 2298555.

55589220 is a `hidden beast` number, since 55 + 589 + 2 + 20 = 666.

It is a super-2 number, since 2×55589220² = 6180322760416800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (55589227) 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 31 ways as a sum of consecutive naturals, for example, 60565 + ... + 61475.

It is an arithmetic number, because the mean of its divisors is an integer number (1819440).

Almost surely, 2^55589220 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 55589220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87333120).

55589220 is an abundant number, since it is smaller than the sum of its proper divisors (119077020).

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

55589220 is a wasteful number, since it uses less digits than its factorization.

55589220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042 (or 1034 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The square root of 55589220 is about 7455.8178625822. The cubic root of 55589220 is about 381.6484709601.

The spelling of 55589220 in words is "fifty-five million, five hundred eighty-nine thousand, two hundred twenty".