55816 has 8 divisors (see below), whose sum is σ = 104670. Its totient is φ = 27904.

The previous prime is 55813. The next prime is 55817. The reversal of 55816 is 61855.

55816 is nontrivially palindromic in base 15.

It can be written as a sum of positive squares in only one way, i.e., 52900 + 2916 = 230^2 + 54^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (55813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3481 + ... + 3496.

2⁵⁵⁸¹⁶ is an apocalyptic number.

It is an amenable number.

55816 is a deficient number, since it is larger than the sum of its proper divisors (48854).

55816 is a wasteful number, since it uses less digits than its factorization.

55816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6983 (or 6979 counting only the distinct ones).

The product of its digits is 1200, while the sum is 25.

The square root of 55816 is about 236.2541004935. The cubic root of 55816 is about 38.2166753764.

The spelling of 55816 in words is "fifty-five thousand, eight hundred sixteen".