78818681887 has 8 divisors (see below), whose sum is σ = 85991547600. Its totient is φ = 71647071360.

The previous prime is 78818681881. The next prime is 78818681891.

78818681887 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 78818681887 - 2⁷ = 78818681759 is a prime.

It is a super-2 number, since 2×78818681887² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78818681881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180012 + ... + 435937.

It is an arithmetic number, because the mean of its divisors is an integer number (10748943450).

Almost surely, 2^78818681887 is an apocalyptic number.

78818681887 is a deficient number, since it is larger than the sum of its proper divisors (7172865713).

78818681887 is a wasteful number, since it uses less digits than its factorization.

78818681887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627593.

The product of its digits is 77070336, while the sum is 70.

The spelling of 78818681887 in words is "seventy-eight billion, eight hundred eighteen million, six hundred eighty-one thousand, eight hundred eighty-seven".