55278517 has 12 divisors (see below), whose sum is σ = 64685196. Its totient is φ = 47100480.

The previous prime is 55278511. The next prime is 55278529. The reversal of 55278517 is 71587255.

It can be written as a sum of positive squares in 2 ways, for example, as 50779876 + 4498641 = 7126^2 + 2121^2 .

It is a de Polignac number, because none of the positive numbers 2^k-55278517 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55278517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55278511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5217 + ... + 11737.

It is an arithmetic number, because the mean of its divisors is an integer number (5390433).

Almost surely, 2^55278517 is an apocalyptic number.

It is an amenable number.

55278517 is a deficient number, since it is larger than the sum of its proper divisors (9406679).

55278517 is a wasteful number, since it uses less digits than its factorization.

55278517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6708 (or 6701 counting only the distinct ones).

The product of its digits is 98000, while the sum is 40.

The square root of 55278517 is about 7434.9523872046. The cubic root of 55278517 is about 380.9360970066.

The spelling of 55278517 in words is "fifty-five million, two hundred seventy-eight thousand, five hundred seventeen".