228865345 has 4 divisors (see below), whose sum is σ = 274638420. Its totient is φ = 183092272.

The previous prime is 228865327. The next prime is 228865349. The reversal of 228865345 is 543568822.

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

It can be written as a sum of positive squares in 2 ways, for example, as 52533504 + 176331841 = 7248^2 + 13279^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228865345 is a prime.

It is a super-2 number, since 2×228865345² = 104758692283938050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (228865349) 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, 22886530 + ... + 22886539.

It is an arithmetic number, because the mean of its divisors is an integer number (68659605).

Almost surely, 2^228865345 is an apocalyptic number.

It is an amenable number.

228865345 is a deficient number, since it is larger than the sum of its proper divisors (45773075).

228865345 is an equidigital number, since it uses as much as digits as its factorization.

228865345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45773074.

The product of its digits is 460800, while the sum is 43.

The square root of 228865345 is about 15128.2961697608. The cubic root of 228865345 is about 611.6833776301.

The spelling of 228865345 in words is "two hundred twenty-eight million, eight hundred sixty-five thousand, three hundred forty-five".