12881556 has 36 divisors (see below), whose sum is σ = 32760000. Its totient is φ = 4267728.

The previous prime is 12881551. The next prime is 12881579. The reversal of 12881556 is 65518821.

12881556 is a `hidden beast` number, since 1 + 28 + 81 + 556 = 666.

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

It is a super-2 number, since 2×12881556² = 331868969962272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 12881556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12881551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5445 + ... + 7443.

It is an arithmetic number, because the mean of its divisors is an integer number (910000).

Almost surely, 2^12881556 is an apocalyptic number.

It is an amenable number.

12881556 is an abundant number, since it is smaller than the sum of its proper divisors (19878444).

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

12881556 is a wasteful number, since it uses less digits than its factorization.

12881556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2188 (or 2183 counting only the distinct ones).

The product of its digits is 19200, while the sum is 36.

The square root of 12881556 is about 3589.0884636632. The cubic root of 12881556 is about 234.4171825942.

The spelling of 12881556 in words is "twelve million, eight hundred eighty-one thousand, five hundred fifty-six".