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12728697 = 310913889
BaseRepresentation
bin110000100011…
…100101111001
3212221200111020
4300203211321
511224304242
61132453053
7213122622
oct60434571
925850436
1012728697
117204293
12431a189
132838897
141994a49
1511b66ec
hexc23979

12728697 has 8 divisors (see below), whose sum is σ = 16991520. Its totient is φ = 8475840.

The previous prime is 12728663. The next prime is 12728707. The reversal of 12728697 is 79682721.

12728697 is digitally balanced in base 2 and base 4, because in such bases 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 12728697 - 214 = 12712313 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (12728657) 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, 1329 + ... + 5217.

It is an arithmetic number, because the mean of its divisors is an integer number (2123940).

Almost surely, 212728697 is an apocalyptic number.

It is an amenable number.

12728697 is a deficient number, since it is larger than the sum of its proper divisors (4262823).

12728697 is a wasteful number, since it uses less digits than its factorization.

12728697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4983.

The product of its digits is 84672, while the sum is 42.

The square root of 12728697 is about 3567.7299505428. The cubic root of 12728697 is about 233.4862532735.

The spelling of 12728697 in words is "twelve million, seven hundred twenty-eight thousand, six hundred ninety-seven".

Divisors: 1 3 1091 3273 3889 11667 4242899 12728697