55691328 has 112 divisors (see below), whose sum is σ = 183757824. Its totient is φ = 14461440.

The previous prime is 55691297. The next prime is 55691333. The reversal of 55691328 is 82319655.

It is a tau number, because it is divible by the number of its divisors (112).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12901 + ... + 16667.

Almost surely, 2^55691328 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 55691328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91878912).

55691328 is an abundant number, since it is smaller than the sum of its proper divisors (128066496).

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

55691328 is a wasteful number, since it uses less digits than its factorization.

55691328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3800 (or 3790 counting only the distinct ones).

The product of its digits is 64800, while the sum is 39.

The square root of 55691328 is about 7462.6622595425. The cubic root of 55691328 is about 381.8820026074.

The spelling of 55691328 in words is "fifty-five million, six hundred ninety-one thousand, three hundred twenty-eight".