215505028 has 12 divisors (see below), whose sum is σ = 377289472. Its totient is φ = 107708040.

The previous prime is 215505023. The next prime is 215505029. The reversal of 215505028 is 820505512.

It is a junction number, because it is equal to n+sod(n) for n = 215504987 and 215505005.

It is not an unprimeable number, because it can be changed into a prime (215505023) 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, 1333 + ... + 20803.

Almost surely, 2^215505028 is an apocalyptic number.

It is an amenable number.

215505028 is a deficient number, since it is larger than the sum of its proper divisors (161784444).

215505028 is a wasteful number, since it uses less digits than its factorization.

215505028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22242 (or 22240 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 215505028 is about 14680.0895092639. The cubic root of 215505028 is about 599.5413420701.

The spelling of 215505028 in words is "two hundred fifteen million, five hundred five thousand, twenty-eight".