55117216 has 48 divisors (see below), whose sum is σ = 135293760. Its totient is φ = 21473280.

The previous prime is 55117211. The next prime is 55117217. The reversal of 55117216 is 61271155.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (55117211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8721 + ... + 13648.

It is an arithmetic number, because the mean of its divisors is an integer number (2818620).

Almost surely, 2^55117216 is an apocalyptic number.

55117216 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

55117216 is an abundant number, since it is smaller than the sum of its proper divisors (80176544).

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

55117216 is a wasteful number, since it uses less digits than its factorization.

55117216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22397 (or 22389 counting only the distinct ones).

The product of its digits is 2100, while the sum is 28.

The square root of 55117216 is about 7424.0969821252. The cubic root of 55117216 is about 380.5652161230.

The spelling of 55117216 in words is "fifty-five million, one hundred seventeen thousand, two hundred sixteen".