55488721 has 8 divisors (see below), whose sum is σ = 59512320. Its totient is φ = 51575472.

The previous prime is 55488707. The next prime is 55488773. The reversal of 55488721 is 12788455.

55488721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55488721 - 2⁷ = 55488593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55488781) 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, 26545 + ... + 28558.

It is an arithmetic number, because the mean of its divisors is an integer number (7439040).

Almost surely, 2^55488721 is an apocalyptic number.

It is an amenable number.

55488721 is a deficient number, since it is larger than the sum of its proper divisors (4023599).

55488721 is a wasteful number, since it uses less digits than its factorization.

55488721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55175.

The product of its digits is 89600, while the sum is 40.

The square root of 55488721 is about 7449.0751774969. The cubic root of 55488721 is about 381.4183398488.

The spelling of 55488721 in words is "fifty-five million, four hundred eighty-eight thousand, seven hundred twenty-one".