55556280 has 160 divisors (see below), whose sum is σ = 201247200. Its totient is φ = 13665024.

The previous prime is 55556279. The next prime is 55556311. The reversal of 55556280 is 8265555.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 41461 + ... + 42779.

It is an arithmetic number, because the mean of its divisors is an integer number (1257795).

Almost surely, 2^55556280 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 55556280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100623600).

55556280 is an abundant number, since it is smaller than the sum of its proper divisors (145690920).

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

55556280 is a wasteful number, since it uses less digits than its factorization.

55556280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1355 (or 1342 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 36.

The square root of 55556280 is about 7453.6085220516. The cubic root of 55556280 is about 381.5730727410.

The spelling of 55556280 in words is "fifty-five million, five hundred fifty-six thousand, two hundred eighty".