78946864987 has 8 divisors (see below), whose sum is σ = 79073548400. Its totient is φ = 78820245504.

The previous prime is 78946864967. The next prime is 78946865033.

It is a happy number.

78946864987 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 78946864987 - 2²⁷ = 78812647259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78946864967) 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 7 ways as a sum of consecutive naturals, for example, 2861563 + ... + 2889019.

It is an arithmetic number, because the mean of its divisors is an integer number (9884193550).

Almost surely, 2^78946864987 is an apocalyptic number.

78946864987 is a deficient number, since it is larger than the sum of its proper divisors (126683413).

78946864987 is a wasteful number, since it uses less digits than its factorization.

78946864987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31965.

The product of its digits is 1170505728, while the sum is 76.

The spelling of 78946864987 in words is "seventy-eight billion, nine hundred forty-six million, eight hundred sixty-four thousand, nine hundred eighty-seven".