228285215 has 4 divisors (see below), whose sum is σ = 273942264. Its totient is φ = 182628168.

The previous prime is 228285203. The next prime is 228285217. The reversal of 228285215 is 512582822.

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 228285215 - 2¹⁸ = 228023071 is a prime.

It is a super-2 number, since 2×228285215² = 104228278775192450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228285217) 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, 22828517 + ... + 22828526.

It is an arithmetic number, because the mean of its divisors is an integer number (68485566).

Almost surely, 2^228285215 is an apocalyptic number.

228285215 is a deficient number, since it is larger than the sum of its proper divisors (45657049).

228285215 is an equidigital number, since it uses as much as digits as its factorization.

228285215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45657048.

The product of its digits is 25600, while the sum is 35.

The square root of 228285215 is about 15109.1103311876. The cubic root of 228285215 is about 611.1661067556.

The spelling of 228285215 in words is "two hundred twenty-eight million, two hundred eighty-five thousand, two hundred fifteen".