228215945 has 8 divisors (see below), whose sum is σ = 278349000. Its totient is φ = 179579520.

The previous prime is 228215929. The next prime is 228215951. The reversal of 228215945 is 549512822.

It can be written as a sum of positive squares in 4 ways, for example, as 20539024 + 207676921 = 4532^2 + 14411^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 228215945 - 2⁴ = 228215929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 228215899 and 228215908.

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 7 ways as a sum of consecutive naturals, for example, 373820 + ... + 374429.

It is an arithmetic number, because the mean of its divisors is an integer number (34793625).

Almost surely, 2^228215945 is an apocalyptic number.

It is an amenable number.

228215945 is a deficient number, since it is larger than the sum of its proper divisors (50133055).

228215945 is an equidigital number, since it uses as much as digits as its factorization.

228215945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748315.

The product of its digits is 57600, while the sum is 38.

The square root of 228215945 is about 15106.8178316944. The cubic root of 228215945 is about 611.1042838601.

The spelling of 228215945 in words is "two hundred twenty-eight million, two hundred fifteen thousand, nine hundred forty-five".