55812 has 12 divisors (see below), whose sum is σ = 130256. Its totient is φ = 18600.

The previous prime is 55807. The next prime is 55813. The reversal of 55812 is 21855.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×55812² = 6229958688, which contains 22 as substring.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

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 in 3 ways as a sum of consecutive naturals, for example, 2314 + ... + 2337.

2⁵⁵⁸¹² is an apocalyptic number.

It is an amenable number.

55812 is an abundant number, since it is smaller than the sum of its proper divisors (74444).

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 (65128).

55812 is a wasteful number, since it uses less digits than its factorization.

55812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4658 (or 4656 counting only the distinct ones).

The product of its digits is 400, while the sum is 21.

The square root of 55812 is about 236.2456348803. The cubic root of 55812 is about 38.2157624341.

The spelling of 55812 in words is "fifty-five thousand, eight hundred twelve".