55556880 has 80 divisors (see below), whose sum is σ = 174363840. Its totient is φ = 14631424.

The previous prime is 55556873. The next prime is 55556887. The reversal of 55556880 is 8865555.

It is an interprime number because it is at equal distance from previous prime (55556873) and next prime (55556887).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55556887) 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, 18526 + ... + 21314.

It is an arithmetic number, because the mean of its divisors is an integer number (2179548).

Almost surely, 2^55556880 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 55556880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87181920).

55556880 is an abundant number, since it is smaller than the sum of its proper divisors (118806960).

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

55556880 is a wasteful number, since it uses less digits than its factorization.

55556880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2888 (or 2882 counting only the distinct ones).

The product of its (nonzero) digits is 240000, while the sum is 42.

The square root of 55556880 is about 7453.6487709041. The cubic root of 55556880 is about 381.5744463812.

The spelling of 55556880 in words is "fifty-five million, five hundred fifty-six thousand, eight hundred eighty".