55181844 has 24 divisors (see below), whose sum is σ = 143064320. Its totient is φ = 18393912.

The previous prime is 55181843. The next prime is 55181849. The reversal of 55181844 is 44818155.

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

It is a junction number, because it is equal to n+sod(n) for n = 55181799 and 55181808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55181843) 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, 255364 + ... + 255579.

Almost surely, 2^55181844 is an apocalyptic number.

55181844 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

55181844 is an abundant number, since it is smaller than the sum of its proper divisors (87882476).

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

55181844 is a wasteful number, since it uses less digits than its factorization.

55181844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510956 (or 510948 counting only the distinct ones).

The product of its digits is 25600, while the sum is 36.

The square root of 55181844 is about 7428.4482901882. The cubic root of 55181844 is about 380.7139026482.

Adding to 55181844 its reverse (44818155), we get a palindrome (99999999).

The spelling of 55181844 in words is "fifty-five million, one hundred eighty-one thousand, eight hundred forty-four".