55891216 has 20 divisors (see below), whose sum is σ = 108421632. Its totient is φ = 27911456.

The previous prime is 55891183. The next prime is 55891229. The reversal of 55891216 is 61219855.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 16065 + ... + 19231.

Almost surely, 2^55891216 is an apocalyptic number.

It is an amenable number.

55891216 is a deficient number, since it is larger than the sum of its proper divisors (52530416).

55891216 is a wasteful number, since it uses less digits than its factorization.

55891216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4278 (or 4272 counting only the distinct ones).

The product of its digits is 21600, while the sum is 37.

The square root of 55891216 is about 7476.0428035158. The cubic root of 55891216 is about 382.3383422703.

The spelling of 55891216 in words is "fifty-five million, eight hundred ninety-one thousand, two hundred sixteen".