228321645 has 32 divisors (see below), whose sum is σ = 390604032. Its totient is φ = 113482752.

The previous prime is 228321619. The next prime is 228321647. The reversal of 228321645 is 546123822.

It is not a de Polignac number, because 228321645 - 2⁶ = 228321581 is a prime.

It is a super-3 number, since 3×228321645³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228321647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21919 + ... + 30611.

It is an arithmetic number, because the mean of its divisors is an integer number (12206376).

Almost surely, 2^228321645 is an apocalyptic number.

It is an amenable number.

228321645 is a deficient number, since it is larger than the sum of its proper divisors (162282387).

228321645 is a wasteful number, since it uses less digits than its factorization.

228321645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8821.

The product of its digits is 23040, while the sum is 33.

The square root of 228321645 is about 15110.3158471291. The cubic root of 228321645 is about 611.1986152078.

The spelling of 228321645 in words is "two hundred twenty-eight million, three hundred twenty-one thousand, six hundred forty-five".