55987215 has 16 divisors (see below), whose sum is σ = 90419328. Its totient is φ = 29579936.

The previous prime is 55987207. The next prime is 55987237. The reversal of 55987215 is 51278955.

55987215 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55987215 - 2³ = 55987207 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 15837 + ... + 19046.

It is an arithmetic number, because the mean of its divisors is an integer number (5651208).

Almost surely, 2^55987215 is an apocalyptic number.

55987215 is a deficient number, since it is larger than the sum of its proper divisors (34432113).

55987215 is a wasteful number, since it uses less digits than its factorization.

55987215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34998.

The product of its digits is 126000, while the sum is 42.

The square root of 55987215 is about 7482.4604910417. The cubic root of 55987215 is about 382.5571190704.

The spelling of 55987215 in words is "fifty-five million, nine hundred eighty-seven thousand, two hundred fifteen".