55067220 has 144 divisors (see below), whose sum is σ = 182446992. Its totient is φ = 13363200.

The previous prime is 55067197. The next prime is 55067227. The reversal of 55067220 is 2276055.

It can be written as a sum of positive squares in 8 ways, for example, as 956484 + 54110736 = 978^2 + 7356^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55067227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 236224 + ... + 236456.

It is an arithmetic number, because the mean of its divisors is an integer number (1266993).

Almost surely, 2^55067220 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 55067220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91223496).

55067220 is an abundant number, since it is smaller than the sum of its proper divisors (127379772).

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

55067220 is a wasteful number, since it uses less digits than its factorization.

55067220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362 (or 357 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 55067220 is about 7420.7290746934. The cubic root of 55067220 is about 380.4501129799.

The spelling of 55067220 in words is "fifty-five million, sixty-seven thousand, two hundred twenty".