55480321 has 8 divisors (see below), whose sum is σ = 60179840. Its totient is φ = 50842512.

The previous prime is 55480319. The next prime is 55480349. The reversal of 55480321 is 12308455.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55480321 - 2¹ = 55480319 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55480321.

It is not an unprimeable number, because it can be changed into a prime (55480391) 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, 13545 + ... + 17158.

It is an arithmetic number, because the mean of its divisors is an integer number (7522480).

Almost surely, 2^55480321 is an apocalyptic number.

It is an amenable number.

55480321 is a deficient number, since it is larger than the sum of its proper divisors (4699519).

55480321 is a wasteful number, since it uses less digits than its factorization.

55480321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30855.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 55480321 is about 7448.5113277755. The cubic root of 55480321 is about 381.3990922391.

Adding to 55480321 its reverse (12308455), we get a palindrome (67788776).

The spelling of 55480321 in words is "fifty-five million, four hundred eighty thousand, three hundred twenty-one".