55556520 has 64 divisors (see below), whose sum is σ = 167469120. Its totient is φ = 14744064.

The previous prime is 55556519. The next prime is 55556521. The reversal of 55556520 is 2565555.

It is an interprime number because it is at equal distance from previous prime (55556519) and next prime (55556521).

It is not an unprimeable number, because it can be changed into a prime (55556521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26967 + ... + 28953.

It is an arithmetic number, because the mean of its divisors is an integer number (2616705).

Almost surely, 2^55556520 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 55556520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83734560).

55556520 is an abundant number, since it is smaller than the sum of its proper divisors (111912600).

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

55556520 is a wasteful number, since it uses less digits than its factorization.

55556520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2234 (or 2230 counting only the distinct ones).

The product of its (nonzero) digits is 37500, while the sum is 33.

The square root of 55556520 is about 7453.6246216187. The cubic root of 55556520 is about 381.5736221983.

It can be divided in two parts, 555 and 56520, that added together give a palindrome (57075).

The spelling of 55556520 in words is "fifty-five million, five hundred fifty-six thousand, five hundred twenty".