55712220 has 48 divisors (see below), whose sum is σ = 157762080. Its totient is φ = 14688256.

The previous prime is 55712197. The next prime is 55712227. The reversal of 55712220 is 2221755.

55712220 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 not an unprimeable number, because it can be changed into a prime (55712227) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 124 + ... + 10556.

It is an arithmetic number, because the mean of its divisors is an integer number (3286710).

Almost surely, 2^55712220 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 55712220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78881040).

55712220 is an abundant number, since it is smaller than the sum of its proper divisors (102049860).

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

55712220 is a wasteful number, since it uses less digits than its factorization.

55712220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10534 (or 10532 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 55712220 is about 7464.0618968495. The cubic root of 55712220 is about 381.9297496064.

Adding to 55712220 its reverse (2221755), we get a palindrome (57933975).

The spelling of 55712220 in words is "fifty-five million, seven hundred twelve thousand, two hundred twenty".