78994049987 has 4 divisors (see below), whose sum is σ = 78994695120. Its totient is φ = 78993404856.

The previous prime is 78994049971. The next prime is 78994049993.

78994049987 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 78994049987 - 2⁴ = 78994049971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78994049917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76148 + ... + 404705.

It is an arithmetic number, because the mean of its divisors is an integer number (19748673780).

Almost surely, 2^78994049987 is an apocalyptic number.

78994049987 is a deficient number, since it is larger than the sum of its proper divisors (645133).

78994049987 is a wasteful number, since it uses less digits than its factorization.

78994049987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645132.

The product of its (nonzero) digits is 329204736, while the sum is 74.

The spelling of 78994049987 in words is "seventy-eight billion, nine hundred ninety-four million, forty-nine thousand, nine hundred eighty-seven".