55443340 has 48 divisors (see below), whose sum is σ = 124363008. Its totient is φ = 20712384.

The previous prime is 55443329. The next prime is 55443359. The reversal of 55443340 is 4334455.

It is a junction number, because it is equal to n+sod(n) for n = 55443299 and 55443308.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 18379 + ... + 21181.

It is an arithmetic number, because the mean of its divisors is an integer number (2590896).

Almost surely, 2^55443340 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55443340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62181504).

55443340 is an abundant number, since it is smaller than the sum of its proper divisors (68919668).

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

55443340 is a wasteful number, since it uses less digits than its factorization.

55443340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2878 (or 2876 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 28.

The square root of 55443340 is about 7446.0284716082. The cubic root of 55443340 is about 381.3143315253.

Adding to 55443340 its reverse (4334455), we get a palindrome (59777795).

The spelling of 55443340 in words is "fifty-five million, four hundred forty-three thousand, three hundred forty".