55578 has 16 divisors (see below), whose sum is σ = 113760. Its totient is φ = 18096.

The previous prime is 55547. The next prime is 55579. The reversal of 55578 is 87555.

It is a happy number.

55578 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (55579) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 276 + ... + 432.

It is an arithmetic number, because the mean of its divisors is an integer number (7110).

2⁵⁵⁵⁷⁸ is an apocalyptic number.

55578 is an abundant number, since it is smaller than the sum of its proper divisors (58182).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56880).

55578 is a wasteful number, since it uses less digits than its factorization.

55578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221.

The product of its digits is 7000, while the sum is 30.

The square root of 55578 is about 235.7498674443. The cubic root of 55578 is about 38.1622792217.

It can be divided in two parts, 5557 and 8, that added together give a triangular number (5565 = T₁₀₅).

The spelling of 55578 in words is "fifty-five thousand, five hundred seventy-eight".