55225520 has 80 divisors (see below), whose sum is σ = 155400768. Its totient is φ = 17817600.

The previous prime is 55225463. The next prime is 55225543. The reversal of 55225520 is 2552255.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 55225520.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6620 + ... + 12420.

Almost surely, 2^55225520 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 55225520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77700384).

55225520 is an abundant number, since it is smaller than the sum of its proper divisors (100175248).

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

55225520 is a wasteful number, since it uses less digits than its factorization.

55225520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5838 (or 5832 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 26.

The square root of 55225520 is about 7431.3874882151. The cubic root of 55225520 is about 380.8143201898.

Adding to 55225520 its reverse (2552255), we get a palindrome (57777775).

The spelling of 55225520 in words is "fifty-five million, two hundred twenty-five thousand, five hundred twenty".