55391304 has 64 divisors (see below), whose sum is σ = 147916800. Its totient is φ = 17224704.

The previous prime is 55391299. The next prime is 55391309. The reversal of 55391304 is 40319355.

It is an interprime number because it is at equal distance from previous prime (55391299) and next prime (55391309).

It is not an unprimeable number, because it can be changed into a prime (55391309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51282 + ... + 52350.

It is an arithmetic number, because the mean of its divisors is an integer number (2311200).

Almost surely, 2^55391304 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 55391304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73958400).

55391304 is an abundant number, since it is smaller than the sum of its proper divisors (92525496).

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

55391304 is a wasteful number, since it uses less digits than its factorization.

55391304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222 (or 1218 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 30.

The square root of 55391304 is about 7442.5334396293. The cubic root of 55391304 is about 381.1950007914.

The spelling of 55391304 in words is "fifty-five million, three hundred ninety-one thousand, three hundred four".