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28682521 = 74097503
BaseRepresentation
bin110110101101…
…0100100011001
31222222020000121
41231122210121
524320320041
62502433241
7465540340
oct155324431
958866017
1028682521
111521066a
129732821
135c3340a
143b48b57
1527b87d1
hex1b5a919

28682521 has 4 divisors (see below), whose sum is σ = 32780032. Its totient is φ = 24585012.

The previous prime is 28682473. The next prime is 28682531. The reversal of 28682521 is 12528682.

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: 12528682 = 26264341.

It is a cyclic number.

It is not a de Polignac number, because 28682521 - 223 = 20293913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28682531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2048745 + ... + 2048758.

It is an arithmetic number, because the mean of its divisors is an integer number (8195008).

Almost surely, 228682521 is an apocalyptic number.

It is an amenable number.

28682521 is a deficient number, since it is larger than the sum of its proper divisors (4097511).

28682521 is an equidigital number, since it uses as much as digits as its factorization.

28682521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4097510.

The product of its digits is 15360, while the sum is 34.

The square root of 28682521 is about 5355.6065016018. The cubic root of 28682521 is about 306.1064213265.

The spelling of 28682521 in words is "twenty-eight million, six hundred eighty-two thousand, five hundred twenty-one".

Divisors: 1 7 4097503 28682521