55820216 has 8 divisors (see below), whose sum is σ = 104662920. Its totient is φ = 27910104.

The previous prime is 55820207. The next prime is 55820227. The reversal of 55820216 is 61202855.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3488756 + ... + 3488771.

It is an arithmetic number, because the mean of its divisors is an integer number (13082865).

Almost surely, 2^55820216 is an apocalyptic number.

It is an amenable number.

55820216 is a deficient number, since it is larger than the sum of its proper divisors (48842704).

55820216 is a wasteful number, since it uses less digits than its factorization.

55820216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6977533 (or 6977529 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 55820216 is about 7471.2927930847. The cubic root of 55820216 is about 382.1763757031.

The spelling of 55820216 in words is "fifty-five million, eight hundred twenty thousand, two hundred sixteen".