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68528213 = 135271401
BaseRepresentation
bin1000001010110…
…10100001010101
311202221121000222
410011122201111
5120020400323
610444444125
71461323465
oct405324125
9152847028
1068528213
1135756296
121ab49645
1311274950
14915bba5
1560399c8
hex415a855

68528213 has 4 divisors (see below), whose sum is σ = 73799628. Its totient is φ = 63256800.

The previous prime is 68528177. The next prime is 68528219. The reversal of 68528213 is 31282586.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41049649 + 27478564 = 6407^2 + 5242^2 .

It is a cyclic number.

It is not a de Polignac number, because 68528213 - 26 = 68528149 is a prime.

It is a super-2 number, since 2×685282132 = 9392231953946738, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68528219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2635688 + ... + 2635713.

It is an arithmetic number, because the mean of its divisors is an integer number (18449907).

Almost surely, 268528213 is an apocalyptic number.

It is an amenable number.

68528213 is a deficient number, since it is larger than the sum of its proper divisors (5271415).

68528213 is a wasteful number, since it uses less digits than its factorization.

68528213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5271414.

The product of its digits is 23040, while the sum is 35.

The square root of 68528213 is about 8278.1769128233. The cubic root of 68528213 is about 409.2196400006.

The spelling of 68528213 in words is "sixty-eight million, five hundred twenty-eight thousand, two hundred thirteen".

Divisors: 1 13 5271401 68528213