55321660 has 24 divisors (see below), whose sum is σ = 119316960. Its totient is φ = 21530304.

The previous prime is 55321649. The next prime is 55321661. The reversal of 55321660 is 6612355.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55321661) 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 7 ways as a sum of consecutive naturals, for example, 36640 + ... + 38119.

It is an arithmetic number, because the mean of its divisors is an integer number (4971540).

Almost surely, 2^55321660 is an apocalyptic number.

It is an amenable number.

55321660 is an abundant number, since it is smaller than the sum of its proper divisors (63995300).

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

55321660 is a wasteful number, since it uses less digits than its factorization.

55321660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74805 (or 74803 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 55321660 is about 7437.8531848915. The cubic root of 55321660 is about 381.0351737860.

The spelling of 55321660 in words is "fifty-five million, three hundred twenty-one thousand, six hundred sixty".