78721412787 has 16 divisors (see below), whose sum is σ = 119776325280. Its totient is φ = 51062537376.

The previous prime is 78721412779. The next prime is 78721412789.

78721412787 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 78721412787 - 2³ = 78721412779 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (78721412789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39399108 + ... + 39401105.

It is an arithmetic number, because the mean of its divisors is an integer number (7486020330).

Almost surely, 2^78721412787 is an apocalyptic number.

78721412787 is a deficient number, since it is larger than the sum of its proper divisors (41054912493).

78721412787 is a wasteful number, since it uses less digits than its factorization.

78721412787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78800259 (or 78800253 counting only the distinct ones).

The product of its digits is 2458624, while the sum is 54.

The spelling of 78721412787 in words is "seventy-eight billion, seven hundred twenty-one million, four hundred twelve thousand, seven hundred eighty-seven".