55278216 has 96 divisors (see below), whose sum is σ = 173759040. Its totient is φ = 15548544.

The previous prime is 55278211. The next prime is 55278241. The reversal of 55278216 is 61287255.

It is a happy number.

55278216 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (55278211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32950 + ... + 34586.

It is an arithmetic number, because the mean of its divisors is an integer number (1809990).

Almost surely, 2^55278216 is an apocalyptic number.

55278216 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55278216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86879520).

55278216 is an abundant number, since it is smaller than the sum of its proper divisors (118480824).

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

55278216 is a wasteful number, since it uses less digits than its factorization.

55278216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1723 (or 1716 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 55278216 is about 7434.9321449493. The cubic root of 55278216 is about 380.9354055868.

The spelling of 55278216 in words is "fifty-five million, two hundred seventy-eight thousand, two hundred sixteen".