55811830 has 16 divisors (see below), whose sum is σ = 101352384. Its totient is φ = 22126720.

The previous prime is 55811803. The next prime is 55811837. The reversal of 55811830 is 3811855.

It is a super-2 number, since 2×55811830² = 6229920735897800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55811792 and 55811801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55811837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23566 + ... + 25825.

It is an arithmetic number, because the mean of its divisors is an integer number (6334524).

Almost surely, 2^55811830 is an apocalyptic number.

55811830 is a deficient number, since it is larger than the sum of its proper divisors (45540554).

55811830 is a wasteful number, since it uses less digits than its factorization.

55811830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49511.

The product of its (nonzero) digits is 4800, while the sum is 31.

The square root of 55811830 is about 7470.7315572171. The cubic root of 55811830 is about 382.1572363314.

The spelling of 55811830 in words is "fifty-five million, eight hundred eleven thousand, eight hundred thirty".