55003424 has 72 divisors (see below), whose sum is σ = 129201408. Its totient is φ = 22556160.

The previous prime is 55003409. The next prime is 55003439. The reversal of 55003424 is 42430055.

55003424 = 1317² + 1318² + ... + 1347².

It is an interprime number because it is at equal distance from previous prime (55003409) and next prime (55003439).

It is a self number, because there is not a number n which added to its sum of digits gives 55003424.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 617972 + ... + 618060.

It is an arithmetic number, because the mean of its divisors is an integer number (1794464).

Almost surely, 2^55003424 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 55003424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64600704).

55003424 is an abundant number, since it is smaller than the sum of its proper divisors (74197984).

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

55003424 is an equidigital number, since it uses as much as digits as its factorization.

55003424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226 (or 129 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 55003424 is about 7416.4293295359. The cubic root of 55003424 is about 380.3031376149.

Adding to 55003424 its reverse (42430055), we get a palindrome (97433479).

The spelling of 55003424 in words is "fifty-five million, three thousand, four hundred twenty-four".