55210640 has 40 divisors (see below), whose sum is σ = 129654648. Its totient is φ = 21862400.

The previous prime is 55210633. The next prime is 55210663. The reversal of 55210640 is 4601255.

It can be written as a sum of positive squares in 4 ways, for example, as 8479744 + 46730896 = 2912^2 + 6836^2 .

It is a tau number, because it is divible by the number of its divisors (40).

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 7 ways as a sum of consecutive naturals, for example, 4664 + ... + 11496.

Almost surely, 2^55210640 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 55210640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64827324).

55210640 is an abundant number, since it is smaller than the sum of its proper divisors (74444008).

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

55210640 is a wasteful number, since it uses less digits than its factorization.

55210640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6947 (or 6941 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 55210640 is about 7430.3862618305. The cubic root of 55210640 is about 380.7801148315.

Adding to 55210640 its reverse (4601255), we get a palindrome (59811895).

The spelling of 55210640 in words is "fifty-five million, two hundred ten thousand, six hundred forty".