12691528 has 16 divisors (see below), whose sum is σ = 23920380. Its totient is φ = 6312768.

The previous prime is 12691519. The next prime is 12691529. The reversal of 12691528 is 82519621.

It can be written as a sum of positive squares in 2 ways, for example, as 10125124 + 2566404 = 3182^2 + 1602^2 .

It is a super-2 number, since 2×12691528² = 322149765949568, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12691493 and 12691502.

It is not an unprimeable number, because it can be changed into a prime (12691529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2451 + ... + 5602.

Almost surely, 2^12691528 is an apocalyptic number.

It is an amenable number.

12691528 is a deficient number, since it is larger than the sum of its proper divisors (11228852).

12691528 is a wasteful number, since it uses less digits than its factorization.

12691528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8256 (or 8252 counting only the distinct ones).

The product of its digits is 8640, while the sum is 34.

The square root of 12691528 is about 3562.5170876783. The cubic root of 12691528 is about 233.2587643803.

The spelling of 12691528 in words is "twelve million, six hundred ninety-one thousand, five hundred twenty-eight".