12661672 has 8 divisors (see below), whose sum is σ = 23740650. Its totient is φ = 6330832.

The previous prime is 12661669. The next prime is 12661679. The reversal of 12661672 is 27616621.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11329956 + 1331716 = 3366^2 + 1154^2 .

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

It is not an unprimeable number, because it can be changed into a prime (12661679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 791347 + ... + 791362.

Almost surely, 2^12661672 is an apocalyptic number.

It is an amenable number.

12661672 is a deficient number, since it is larger than the sum of its proper divisors (11078978).

12661672 is a wasteful number, since it uses less digits than its factorization.

12661672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1582715 (or 1582711 counting only the distinct ones).

The product of its digits is 6048, while the sum is 31.

The square root of 12661672 is about 3558.3243247349. The cubic root of 12661672 is about 233.0757120391.

The spelling of 12661672 in words is "twelve million, six hundred sixty-one thousand, six hundred seventy-two".