78678968369 has 4 divisors (see below), whose sum is σ = 78963008244. Its totient is φ = 78394928496.

The previous prime is 78678968321. The next prime is 78678968371. The reversal of 78678968369 is 96386987687.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42222030400 + 36456937969 = 205480^2 + 190937^2 .

It is a cyclic number.

It is not a de Polignac number, because 78678968369 - 2³² = 74384001073 is a prime.

It is a super-2 number, since 2×78678968369² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78678968369.

It is not an unprimeable number, because it can be changed into a prime (78678968869) 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, 142019522 + ... + 142020075.

It is an arithmetic number, because the mean of its divisors is an integer number (19740752061).

Almost surely, 2^78678968369 is an apocalyptic number.

It is an amenable number.

78678968369 is a deficient number, since it is larger than the sum of its proper divisors (284039875).

78678968369 is a wasteful number, since it uses less digits than its factorization.

78678968369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284039874.

The product of its digits is 1316818944, while the sum is 77.

The spelling of 78678968369 in words is "seventy-eight billion, six hundred seventy-eight million, nine hundred sixty-eight thousand, three hundred sixty-nine".