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12782661 = 310142187
BaseRepresentation
bin110000110000…
…110001000101
3220001102111220
4300300301011
511233021121
61133550553
7213436143
oct60606105
926042456
1012782661
117240891
124345459
132857308
1419aa593
1511c76c6
hexc30c45

12782661 has 8 divisors (see below), whose sum is σ = 17212704. Its totient is φ = 8437200.

The previous prime is 12782659. The next prime is 12782683. The reversal of 12782661 is 16628721.

12782661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12782661 - 21 = 12782659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12782761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20791 + ... + 21396.

It is an arithmetic number, because the mean of its divisors is an integer number (2151588).

Almost surely, 212782661 is an apocalyptic number.

It is an amenable number.

12782661 is a deficient number, since it is larger than the sum of its proper divisors (4430043).

12782661 is a wasteful number, since it uses less digits than its factorization.

12782661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42291.

The product of its digits is 8064, while the sum is 33.

The square root of 12782661 is about 3575.2847439050. The cubic root of 12782661 is about 233.8157472789.

The spelling of 12782661 in words is "twelve million, seven hundred eighty-two thousand, six hundred sixty-one".

Divisors: 1 3 101 303 42187 126561 4260887 12782661