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681028 = 22891913
BaseRepresentation
bin10100110010001000100
31021121012021
42212101010
5133243103
622332524
75534335
oct2462104
91247167
10681028
11425737
1228a144
131aac9a
1413a28c
15d6bbd
hexa6444

681028 has 12 divisors (see below), whose sum is σ = 1205820. Its totient is φ = 336512.

The previous prime is 681019. The next prime is 681041. The reversal of 681028 is 820186.

It can be written as a sum of positive squares in 2 ways, for example, as 369664 + 311364 = 608^2 + 558^2 .

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 680993 and 681011.

It is an unprimeable number.

681028 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 601 + ... + 1312.

It is an arithmetic number, because the mean of its divisors is an integer number (100485).

2681028 is an apocalyptic number.

It is an amenable number.

681028 is a deficient number, since it is larger than the sum of its proper divisors (524792).

681028 is a wasteful number, since it uses less digits than its factorization.

681028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2006 (or 2004 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 681028 is about 825.2442062808. The cubic root of 681028 is about 87.9808842777.

The spelling of 681028 in words is "six hundred eighty-one thousand, twenty-eight".

Divisors: 1 2 4 89 178 356 1913 3826 7652 170257 340514 681028