12628581 has 16 divisors (see below), whose sum is σ = 19764864. Its totient is φ = 7020864.

The previous prime is 12628579. The next prime is 12628591. The reversal of 12628581 is 18582621.

It is not a de Polignac number, because 12628581 - 2¹ = 12628579 is a prime.

It is a super-2 number, since 2×12628581² = 318962116147122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12628591) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7350 + ... + 8903.

It is an arithmetic number, because the mean of its divisors is an integer number (1235304).

Almost surely, 2^12628581 is an apocalyptic number.

It is an amenable number.

12628581 is a deficient number, since it is larger than the sum of its proper divisors (7136283).

12628581 is a wasteful number, since it uses less digits than its factorization.

12628581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16300.

The product of its digits is 7680, while the sum is 33.

The square root of 12628581 is about 3553.6714817214. The cubic root of 12628581 is about 232.8724888219.

The spelling of 12628581 in words is "twelve million, six hundred twenty-eight thousand, five hundred eighty-one".