78984648987 has 4 divisors (see below), whose sum is σ = 105312865320. Its totient is φ = 52656432656.

The previous prime is 78984648959. The next prime is 78984648997.

78984648987 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 78984648987 - 2⁷ = 78984648859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78984648937) 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, 13164108162 + ... + 13164108167.

It is an arithmetic number, because the mean of its divisors is an integer number (26328216330).

Almost surely, 2^78984648987 is an apocalyptic number.

78984648987 is a deficient number, since it is larger than the sum of its proper divisors (26328216333).

78984648987 is a wasteful number, since it uses less digits than its factorization.

78984648987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26328216332.

The product of its digits is 1560674304, while the sum is 78.

The spelling of 78984648987 in words is "seventy-eight billion, nine hundred eighty-four million, six hundred forty-eight thousand, nine hundred eighty-seven".