78949294987 has 4 divisors (see below), whose sum is σ = 79013430496. Its totient is φ = 78885159480.

The previous prime is 78949294961. The next prime is 78949294993.

78949294987 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 78949294987 - 2¹⁹ = 78948770699 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 (78949292987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32065908 + ... + 32068369.

It is an arithmetic number, because the mean of its divisors is an integer number (19753357624).

Almost surely, 2^78949294987 is an apocalyptic number.

78949294987 is a deficient number, since it is larger than the sum of its proper divisors (64135509).

78949294987 is a wasteful number, since it uses less digits than its factorization.

78949294987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64135508.

The product of its digits is 658409472, while the sum is 76.

The spelling of 78949294987 in words is "seventy-eight billion, nine hundred forty-nine million, two hundred ninety-four thousand, nine hundred eighty-seven".