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228485779 = 317370509
BaseRepresentation
bin11011001111001…
…10101010010011
3120220221021120021
431213212222103
5431443021104
634401124311
75443045204
oct1547465223
9526837507
10228485779
11107a79825
1264629697
133844bcb2
14224b95ab
15150d4754
hexd9e6a93

228485779 has 4 divisors (see below), whose sum is σ = 235856320. Its totient is φ = 221115240.

The previous prime is 228485737. The next prime is 228485783. The reversal of 228485779 is 977584822.

It is a happy number.

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 228485779 - 27 = 228485651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228485479) 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, 3685224 + ... + 3685285.

It is an arithmetic number, because the mean of its divisors is an integer number (58964080).

Almost surely, 2228485779 is an apocalyptic number.

228485779 is a deficient number, since it is larger than the sum of its proper divisors (7370541).

228485779 is an equidigital number, since it uses as much as digits as its factorization.

228485779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7370540.

The product of its digits is 2257920, while the sum is 52.

The square root of 228485779 is about 15115.7460616405. The cubic root of 228485779 is about 611.3450379504.

The spelling of 228485779 in words is "two hundred twenty-eight million, four hundred eighty-five thousand, seven hundred seventy-nine".

Divisors: 1 31 7370509 228485779