12767661 has 12 divisors (see below), whose sum is σ = 18567900. Its totient is φ = 8453760.

The previous prime is 12767633. The next prime is 12767669. The reversal of 12767661 is 16676721.

12767661 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 3348900 + 9418761 = 1830^2 + 3069^2 .

It is not a de Polignac number, because 12767661 - 2¹⁹ = 12243373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12767669) 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, 3420 + ... + 6101.

It is an arithmetic number, because the mean of its divisors is an integer number (1547325).

Almost surely, 2^12767661 is an apocalyptic number.

It is an amenable number.

12767661 is a deficient number, since it is larger than the sum of its proper divisors (5800239).

12767661 is a wasteful number, since it uses less digits than its factorization.

12767661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9676 (or 9673 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 12767661 is about 3573.1863931231. The cubic root of 12767661 is about 233.7242533149.

The spelling of 12767661 in words is "twelve million, seven hundred sixty-seven thousand, six hundred sixty-one".