12690578 has 16 divisors (see below), whose sum is σ = 19366776. Its totient is φ = 6236160.

The previous prime is 12690577. The next prime is 12690581. The reversal of 12690578 is 87509621.

It can be written as a sum of positive squares in 4 ways, for example, as 6848689 + 5841889 = 2617^2 + 2417^2 .

It is a super-2 number, since 2×12690578² = 322101539948168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12690571) 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, 52538 + ... + 52778.

Almost surely, 2^12690578 is an apocalyptic number.

12690578 is a deficient number, since it is larger than the sum of its proper divisors (6676198).

12690578 is a wasteful number, since it uses less digits than its factorization.

12690578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 12690578 is about 3562.3837524893. The cubic root of 12690578 is about 233.2529441892.

The spelling of 12690578 in words is "twelve million, six hundred ninety thousand, five hundred seventy-eight".