55012320 has 288 divisors, whose sum is σ = 215115264. Its totient is φ = 12672000.

The previous prime is 55012313. The next prime is 55012327. The reversal of 55012320 is 2321055.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (55012313) and next prime (55012327).

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 55012293 and 55012302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55012327) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 364245 + ... + 364395.

It is an arithmetic number, because the mean of its divisors is an integer number (746928).

Almost surely, 2^55012320 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 55012320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107557632).

55012320 is an abundant number, since it is smaller than the sum of its proper divisors (160102944).

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

55012320 is a wasteful number, since it uses less digits than its factorization.

55012320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206 (or 195 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 55012320 is about 7417.0290548170. The cubic root of 55012320 is about 380.3236393346.

Adding to 55012320 its reverse (2321055), we get a palindrome (57333375).

The spelling of 55012320 in words is "fifty-five million, twelve thousand, three hundred twenty".