78767476787 has 4 divisors (see below), whose sum is σ = 82913133480. Its totient is φ = 74621820096.

The previous prime is 78767476783. The next prime is 78767476807.

78767476787 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78767476787 - 2² = 78767476783 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78767476783) 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, 2072828318 + ... + 2072828355.

It is an arithmetic number, because the mean of its divisors is an integer number (20728283370).

Almost surely, 2^78767476787 is an apocalyptic number.

78767476787 is a deficient number, since it is larger than the sum of its proper divisors (4145656693).

78767476787 is a wasteful number, since it uses less digits than its factorization.

78767476787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4145656692.

The product of its digits is 1084253184, while the sum is 74.

The spelling of 78767476787 in words is "seventy-eight billion, seven hundred sixty-seven million, four hundred seventy-six thousand, seven hundred eighty-seven".