12005078687 has 4 divisors (see below), whose sum is σ = 13720089936. Its totient is φ = 10290067440.

The previous prime is 12005078663. The next prime is 12005078713. The reversal of 12005078687 is 78687050021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78687050021 = 499 ⋅157689479.

It is a cyclic number.

It is not a de Polignac number, because 12005078687 - 2⁶ = 12005078623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12005078627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 857505614 + ... + 857505627.

It is an arithmetic number, because the mean of its divisors is an integer number (3430022484).

Almost surely, 2^12005078687 is an apocalyptic number.

12005078687 is a deficient number, since it is larger than the sum of its proper divisors (1715011249).

12005078687 is an equidigital number, since it uses as much as digits as its factorization.

12005078687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1715011248.

The product of its (nonzero) digits is 188160, while the sum is 44.

The spelling of 12005078687 in words is "twelve billion, five million, seventy-eight thousand, six hundred eighty-seven".