12655620 has 36 divisors (see below), whose sum is σ = 38389260. Its totient is φ = 3374784.

The previous prime is 12655619. The next prime is 12655637. The reversal of 12655620 is 2655621.

12655620 is a `hidden beast` number, since 1 + 2 + 655 + 6 + 2 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3218436 + 9437184 = 1794^2 + 3072^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34975 + ... + 35334.

Almost surely, 2^12655620 is an apocalyptic number.

12655620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12655620 is an abundant number, since it is smaller than the sum of its proper divisors (25733640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12655620 is a wasteful number, since it uses less digits than its factorization.

12655620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70324 (or 70319 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 12655620 is about 3557.4738228130. The cubic root of 12655620 is about 233.0385711041.

Subtracting from 12655620 its reverse (2655621), we obtain a palindrome (9999999).

The spelling of 12655620 in words is "twelve million, six hundred fifty-five thousand, six hundred twenty".