55478417 has 4 divisors (see below), whose sum is σ = 56101860. Its totient is φ = 54854976.

The previous prime is 55478413. The next prime is 55478419. The reversal of 55478417 is 71487455.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4227136 + 51251281 = 2056^2 + 7159^2 .

It is a cyclic number.

It is not a de Polignac number, because 55478417 - 2² = 55478413 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55478411) 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 3 ways as a sum of consecutive naturals, for example, 311588 + ... + 311765.

It is an arithmetic number, because the mean of its divisors is an integer number (14025465).

Almost surely, 2^55478417 is an apocalyptic number.

It is an amenable number.

55478417 is a deficient number, since it is larger than the sum of its proper divisors (623443).

55478417 is an equidigital number, since it uses as much as digits as its factorization.

55478417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623442.

The product of its digits is 156800, while the sum is 41.

The square root of 55478417 is about 7448.3835159046. The cubic root of 55478417 is about 381.3947291774.

The spelling of 55478417 in words is "fifty-five million, four hundred seventy-eight thousand, four hundred seventeen".