12728697457 has 8 divisors (see below), whose sum is σ = 14651739200. Its totient is φ = 10831819824.

The previous prime is 12728697437. The next prime is 12728697479. The reversal of 12728697457 is 75479682721.

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

It is not a de Polignac number, because 12728697457 - 2³¹ = 10581213809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12728697427) 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, 6539982 + ... + 6541927.

It is an arithmetic number, because the mean of its divisors is an integer number (1831467400).

Almost surely, 2^12728697457 is an apocalyptic number.

It is an amenable number.

12728697457 is a deficient number, since it is larger than the sum of its proper divisors (1923041743).

12728697457 is a wasteful number, since it uses less digits than its factorization.

12728697457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13082055.

The product of its digits is 11854080, while the sum is 58.

The spelling of 12728697457 in words is "twelve billion, seven hundred twenty-eight million, six hundred ninety-seven thousand, four hundred fifty-seven".