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28129241 = 74018463
BaseRepresentation
bin110101101001…
…1011111011001
31221221010001202
41223103133121
524200113431
62442523545
7461044310
oct153233731
957833052
1028129241
1114972a08
1295065b5
135a9b62a
143a43277
1527098cb
hex1ad37d9

28129241 has 4 divisors (see below), whose sum is σ = 32147712. Its totient is φ = 24110772.

The previous prime is 28129229. The next prime is 28129243. The reversal of 28129241 is 14292182.

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 an emirpimes, since its reverse is a distinct semiprime: 14292182 = 27146091.

It is a de Polignac number, because none of the positive numbers 2k-28129241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28129243) 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, 2009225 + ... + 2009238.

It is an arithmetic number, because the mean of its divisors is an integer number (8036928).

Almost surely, 228129241 is an apocalyptic number.

It is an amenable number.

28129241 is a deficient number, since it is larger than the sum of its proper divisors (4018471).

28129241 is an equidigital number, since it uses as much as digits as its factorization.

28129241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4018470.

The product of its digits is 2304, while the sum is 29.

The square root of 28129241 is about 5303.7006891415. The cubic root of 28129241 is about 304.1253847104.

The spelling of 28129241 in words is "twenty-eight million, one hundred twenty-nine thousand, two hundred forty-one".

Divisors: 1 7 4018463 28129241