55643316 has 12 divisors (see below), whose sum is σ = 129834432. Its totient is φ = 18547768.

The previous prime is 55643311. The next prime is 55643353. The reversal of 55643316 is 61334655.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55643311) 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 3 ways as a sum of consecutive naturals, for example, 2318460 + ... + 2318483.

It is an arithmetic number, because the mean of its divisors is an integer number (10819536).

Almost surely, 2^55643316 is an apocalyptic number.

It is an amenable number.

55643316 is an abundant number, since it is smaller than the sum of its proper divisors (74191116).

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

55643316 is a wasteful number, since it uses less digits than its factorization.

55643316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4636950 (or 4636948 counting only the distinct ones).

The product of its digits is 32400, while the sum is 33.

The square root of 55643316 is about 7459.4447514544. Note that the first 3 decimals coincide. The cubic root of 55643316 is about 381.7722297409.

The spelling of 55643316 in words is "fifty-five million, six hundred forty-three thousand, three hundred sixteen".