Search a number
-
+
28239241 = 45916151
BaseRepresentation
bin110101110111…
…0010110001001
31222010200221211
41223232112021
524212123431
62445133121
7462013102
oct153562611
958120854
1028239241
1114a38618
12955a1a1
135b09714
143a713a9
15272c2b1
hex1aee589

28239241 has 4 divisors (see below), whose sum is σ = 28249984. Its totient is φ = 28228500.

The previous prime is 28239209. The next prime is 28239259. The reversal of 28239241 is 14293282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28239241 - 25 = 28239209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28239271) 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, 1516 + ... + 7666.

It is an arithmetic number, because the mean of its divisors is an integer number (7062496).

Almost surely, 228239241 is an apocalyptic number.

It is an amenable number.

28239241 is a deficient number, since it is larger than the sum of its proper divisors (10743).

28239241 is an equidigital number, since it uses as much as digits as its factorization.

28239241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10742.

The product of its digits is 6912, while the sum is 31.

The square root of 28239241 is about 5314.0606884002. The cubic root of 28239241 is about 304.5212986936.

The spelling of 28239241 in words is "twenty-eight million, two hundred thirty-nine thousand, two hundred forty-one".

Divisors: 1 4591 6151 28239241