78318481387 has 8 divisors (see below), whose sum is σ = 78715136720. Its totient is φ = 77922825120.

The previous prime is 78318481337. The next prime is 78318481411.

78318481387 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 a de Polignac number, because none of the positive numbers 2^k-78318481387 is a prime.

It is a super-2 number, since 2×78318481387² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78318481337) 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, 92337 + ... + 406402.

It is an arithmetic number, because the mean of its divisors is an integer number (9839392090).

Almost surely, 2^78318481387 is an apocalyptic number.

78318481387 is a deficient number, since it is larger than the sum of its proper divisors (396655333).

78318481387 is a wasteful number, since it uses less digits than its factorization.

78318481387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499533.

The product of its digits is 7225344, while the sum is 58.

The spelling of 78318481387 in words is "seventy-eight billion, three hundred eighteen million, four hundred eighty-one thousand, three hundred eighty-seven".