55138216 has 16 divisors (see below), whose sum is σ = 118153440. Its totient is φ = 23630640.

The previous prime is 55138201. The next prime is 55138219. The reversal of 55138216 is 61283155.

55138216 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (55138219) 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 3 ways as a sum of consecutive naturals, for example, 492250 + ... + 492361.

It is an arithmetic number, because the mean of its divisors is an integer number (7384590).

Almost surely, 2^55138216 is an apocalyptic number.

55138216 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

55138216 is an abundant number, since it is smaller than the sum of its proper divisors (63015224).

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

55138216 is a wasteful number, since it uses less digits than its factorization.

55138216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 984624 (or 984620 counting only the distinct ones).

The product of its digits is 7200, while the sum is 31.

The square root of 55138216 is about 7425.5111608562. The cubic root of 55138216 is about 380.6135425525.

The spelling of 55138216 in words is "fifty-five million, one hundred thirty-eight thousand, two hundred sixteen".