228985605 has 12 divisors (see below), whose sum is σ = 396908460. Its totient is φ = 122125632.

The previous prime is 228985591. The next prime is 228985609. The reversal of 228985605 is 506589822.

228985605 is a `hidden beast` number, since 2 + 2 + 89 + 8 + 560 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 50041476 + 178944129 = 7074^2 + 13377^2 .

It is not a de Polignac number, because 228985605 - 2⁶ = 228985541 is a prime.

It is a super-3 number, since 3×228985605³ (a number of 26 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 5088569 = 228985605 / (2 + 2 + 8 + 9 + 8 + 5 + 6 + 0 + 5).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228985609) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2544240 + ... + 2544329.

It is an arithmetic number, because the mean of its divisors is an integer number (33075705).

Almost surely, 2^228985605 is an apocalyptic number.

It is an amenable number.

228985605 is a deficient number, since it is larger than the sum of its proper divisors (167922855).

228985605 is a wasteful number, since it uses less digits than its factorization.

228985605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5088580 (or 5088577 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The square root of 228985605 is about 15132.2703187592. The cubic root of 228985605 is about 611.7904976228.

The spelling of 228985605 in words is "two hundred twenty-eight million, nine hundred eighty-five thousand, six hundred five".