215228015 has 4 divisors (see below), whose sum is σ = 258273624. Its totient is φ = 172182408.

The previous prime is 215228011. The next prime is 215228023. The reversal of 215228015 is 510822512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 215228015 - 2² = 215228011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215228011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21522797 + ... + 21522806.

It is an arithmetic number, because the mean of its divisors is an integer number (64568406).

Almost surely, 2^215228015 is an apocalyptic number.

215228015 is a deficient number, since it is larger than the sum of its proper divisors (43045609).

215228015 is an equidigital number, since it uses as much as digits as its factorization.

215228015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43045608.

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 215228015 is about 14670.6514851932. The cubic root of 215228015 is about 599.2843458119.

The spelling of 215228015 in words is "two hundred fifteen million, two hundred twenty-eight thousand, fifteen".