55505215 has 8 divisors (see below), whose sum is σ = 66979440. Its totient is φ = 44155392.

The previous prime is 55505207. The next prime is 55505227. The reversal of 55505215 is 51250555.

It is a happy number.

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 55505215 - 2³ = 55505207 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 30114 + ... + 31903.

It is an arithmetic number, because the mean of its divisors is an integer number (8372430).

Almost surely, 2^55505215 is an apocalyptic number.

55505215 is a deficient number, since it is larger than the sum of its proper divisors (11474225).

55505215 is a wasteful number, since it uses less digits than its factorization.

55505215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62201.

The product of its (nonzero) digits is 6250, while the sum is 28.

The square root of 55505215 is about 7450.1822125368. The cubic root of 55505215 is about 381.4561282542.

The spelling of 55505215 in words is "fifty-five million, five hundred five thousand, two hundred fifteen".