55216330 has 64 divisors (see below), whose sum is σ = 113944320. Its totient is φ = 19109376.

The previous prime is 55216327. The next prime is 55216333. The reversal of 55216330 is 3361255.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (55216327) and next prime (55216333).

It is a junction number, because it is equal to n+sod(n) for n = 55216295 and 55216304.

It is not an unprimeable number, because it can be changed into a prime (55216333) 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 31 ways as a sum of consecutive naturals, for example, 176254 + ... + 176566.

It is an arithmetic number, because the mean of its divisors is an integer number (1780380).

Almost surely, 2^55216330 is an apocalyptic number.

55216330 is an abundant number, since it is smaller than the sum of its proper divisors (58727990).

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

55216330 is a wasteful number, since it uses less digits than its factorization.

55216330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415.

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 55216330 is about 7430.7691391941. The cubic root of 55216330 is about 380.7931954287.

Adding to 55216330 its reverse (3361255), we get a palindrome (58577585).

The spelling of 55216330 in words is "fifty-five million, two hundred sixteen thousand, three hundred thirty".