12721768 has 8 divisors (see below), whose sum is σ = 23853330. Its totient is φ = 6360880.

The previous prime is 12721739. The next prime is 12721771. The reversal of 12721768 is 86712721.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 6461764 + 6260004 = 2542^2 + 2502^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 795103 + ... + 795118.

Almost surely, 2^12721768 is an apocalyptic number.

It is an amenable number.

12721768 is a deficient number, since it is larger than the sum of its proper divisors (11131562).

12721768 is a wasteful number, since it uses less digits than its factorization.

12721768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1590227 (or 1590223 counting only the distinct ones).

The product of its digits is 9408, while the sum is 34.

The square root of 12721768 is about 3566.7587527053. The cubic root of 12721768 is about 233.4438786849.

The spelling of 12721768 in words is "twelve million, seven hundred twenty-one thousand, seven hundred sixty-eight".