12561768 has 24 divisors (see below), whose sum is σ = 34021650. Its totient is φ = 4187232.

The previous prime is 12561751. The next prime is 12561799. The reversal of 12561768 is 86716521.

It can be written as a sum of positive squares in only one way, i.e., 10771524 + 1790244 = 3282^2 + 1338^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 87163 + ... + 87306.

Almost surely, 2^12561768 is an apocalyptic number.

12561768 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

12561768 is an abundant number, since it is smaller than the sum of its proper divisors (21459882).

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

12561768 is a wasteful number, since it uses less digits than its factorization.

12561768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174481 (or 174474 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 12561768 is about 3544.2584555870. The cubic root of 12561768 is about 232.4610826294.

The spelling of 12561768 in words is "twelve million, five hundred sixty-one thousand, seven hundred sixty-eight".