55221560 has 32 divisors (see below), whose sum is σ = 125753040. Its totient is φ = 21821184.

The previous prime is 55221557. The next prime is 55221577. The reversal of 55221560 is 6512255.

55221560 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4997 + ... + 11636.

Almost surely, 2^55221560 is an apocalyptic number.

It is an amenable number.

55221560 is an abundant number, since it is smaller than the sum of its proper divisors (70531480).

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

55221560 is a wasteful number, since it uses less digits than its factorization.

55221560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16727 (or 16723 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 55221560 is about 7431.1210459795. The cubic root of 55221560 is about 380.8052177509.

The spelling of 55221560 in words is "fifty-five million, two hundred twenty-one thousand, five hundred sixty".