12787641 has 24 divisors (see below), whose sum is σ = 19109376. Its totient is φ = 8235360.

The previous prime is 12787639. The next prime is 12787667. The reversal of 12787641 is 14678721.

12787641 is a `hidden beast` number, since 1 + 2 + 7 + 8 + 7 + 641 = 666.

It is not a de Polignac number, because 12787641 - 2¹ = 12787639 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12787596 and 12787605.

It is not an unprimeable number, because it can be changed into a prime (12787441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66856 + ... + 67046.

It is an arithmetic number, because the mean of its divisors is an integer number (796224).

Almost surely, 2^12787641 is an apocalyptic number.

It is an amenable number.

12787641 is a deficient number, since it is larger than the sum of its proper divisors (6321735).

12787641 is a wasteful number, since it uses less digits than its factorization.

12787641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413 (or 410 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 12787641 is about 3575.9811241113. The cubic root of 12787641 is about 233.8461074478.

The spelling of 12787641 in words is "twelve million, seven hundred eighty-seven thousand, six hundred forty-one".