78776867787 has 8 divisors (see below), whose sum is σ = 106301315904. Its totient is φ = 51885165768.

The previous prime is 78776867737. The next prime is 78776867821.

78776867787 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78776867787 - 2²⁴ = 78760090571 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78776867737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158186233 + ... + 158186730.

It is an arithmetic number, because the mean of its divisors is an integer number (13287664488).

Almost surely, 2^78776867787 is an apocalyptic number.

78776867787 is a deficient number, since it is larger than the sum of its proper divisors (27524448117).

78776867787 is a wasteful number, since it uses less digits than its factorization.

78776867787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316373049.

The product of its digits is 2168506368, while the sum is 78.

The spelling of 78776867787 in words is "seventy-eight billion, seven hundred seventy-six million, eight hundred sixty-seven thousand, seven hundred eighty-seven".