55721416 has 32 divisors (see below), whose sum is σ = 106156800. Its totient is φ = 27417600.

The previous prime is 55721401. The next prime is 55721417. The reversal of 55721416 is 61412755.

55721416 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (55721417) by changing a digit.

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, 233025 + ... + 233263.

It is an arithmetic number, because the mean of its divisors is an integer number (3317400).

Almost surely, 2^55721416 is an apocalyptic number.

It is an amenable number.

55721416 is a deficient number, since it is larger than the sum of its proper divisors (50435384).

55721416 is a wasteful number, since it uses less digits than its factorization.

55721416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589 (or 585 counting only the distinct ones).

The product of its digits is 8400, while the sum is 31.

The square root of 55721416 is about 7464.6778899026. The cubic root of 55721416 is about 381.9507625473.

The spelling of 55721416 in words is "fifty-five million, seven hundred twenty-one thousand, four hundred sixteen".