55720417 has 4 divisors (see below), whose sum is σ = 55764676. Its totient is φ = 55676160.

The previous prime is 55720403. The next prime is 55720471. The reversal of 55720417 is 71402755.

55720417 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71402755 = 5 ⋅14280551.

It can be written as a sum of positive squares in 2 ways, for example, as 35569296 + 20151121 = 5964^2 + 4489^2 .

It is a cyclic number.

It is not a de Polignac number, because 55720417 - 2⁷ = 55720289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55720477) 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 3 ways as a sum of consecutive naturals, for example, 20184 + ... + 22777.

It is an arithmetic number, because the mean of its divisors is an integer number (13941169).

Almost surely, 2^55720417 is an apocalyptic number.

It is an amenable number.

55720417 is a deficient number, since it is larger than the sum of its proper divisors (44259).

55720417 is a wasteful number, since it uses less digits than its factorization.

55720417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44258.

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 55720417 is about 7464.6109744581. The cubic root of 55720417 is about 381.9484799354.

The spelling of 55720417 in words is "fifty-five million, seven hundred twenty thousand, four hundred seventeen".