55310320 has 60 divisors (see below), whose sum is σ = 139283496. Its totient is φ = 20417280.

The previous prime is 55310303. The next prime is 55310329. The reversal of 55310320 is 2301355.

55310320 = 486² + 487² + ... + 654².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55310329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11475 + ... + 15565.

Almost surely, 2^55310320 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 55310320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69641748).

55310320 is an abundant number, since it is smaller than the sum of its proper divisors (83973176).

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

55310320 is a wasteful number, since it uses less digits than its factorization.

55310320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4130 (or 4111 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 19.

The square root of 55310320 is about 7437.0908290810. The cubic root of 55310320 is about 381.0091367621.

Adding to 55310320 its reverse (2301355), we get a palindrome (57611675).

The spelling of 55310320 in words is "fifty-five million, three hundred ten thousand, three hundred twenty".