55120215 has 16 divisors (see below), whose sum is σ = 88868736. Its totient is φ = 29172000.

The previous prime is 55120189. The next prime is 55120283. The reversal of 55120215 is 51202155.

It is not a de Polignac number, because 55120215 - 2¹⁵ = 55087447 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 55120191 and 55120200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12061 + ... + 15990.

It is an arithmetic number, because the mean of its divisors is an integer number (5554296).

Almost surely, 2^55120215 is an apocalyptic number.

55120215 is a deficient number, since it is larger than the sum of its proper divisors (33748521).

55120215 is a wasteful number, since it uses less digits than its factorization.

55120215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28190.

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 55120215 is about 7424.2989568039. The cubic root of 55120215 is about 380.5721183486.

The spelling of 55120215 in words is "fifty-five million, one hundred twenty thousand, two hundred fifteen".