55443664 has 40 divisors (see below), whose sum is σ = 114903360. Its totient is φ = 25824768.

The previous prime is 55443659. The next prime is 55443673. The reversal of 55443664 is 46634455.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27027 + ... + 29005.

It is an arithmetic number, because the mean of its divisors is an integer number (2872584).

Almost surely, 2^55443664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55443664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57451680).

55443664 is an abundant number, since it is smaller than the sum of its proper divisors (59459696).

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

55443664 is a wasteful number, since it uses less digits than its factorization.

55443664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2107 (or 2101 counting only the distinct ones).

The product of its digits is 172800, while the sum is 37.

The square root of 55443664 is about 7446.0502281411. The cubic root of 55443664 is about 381.3150742992.

The spelling of 55443664 in words is "fifty-five million, four hundred forty-three thousand, six hundred sixty-four".