12705578 has 8 divisors (see below), whose sum is σ = 19573572. Its totient is φ = 6181056.

The previous prime is 12705571. The next prime is 12705587. The reversal of 12705578 is 87550721.

It can be written as a sum of positive squares in 2 ways, for example, as 12694969 + 10609 = 3563^2 + 103^2 .

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

It is a super-2 number, since 2×12705578² = 322863424628168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12705571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85775 + ... + 85922.

Almost surely, 2^12705578 is an apocalyptic number.

12705578 is a deficient number, since it is larger than the sum of its proper divisors (6867994).

12705578 is a wasteful number, since it uses less digits than its factorization.

12705578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171736.

The product of its (nonzero) digits is 19600, while the sum is 35.

The square root of 12705578 is about 3564.4884625988. The cubic root of 12705578 is about 233.3448080525.

The spelling of 12705578 in words is "twelve million, seven hundred five thousand, five hundred seventy-eight".