78368559 has 8 divisors (see below), whose sum is σ = 109991040. Its totient is φ = 49495896.

The previous prime is 78368539. The next prime is 78368561. The reversal of 78368559 is 95586387.

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

It is not a de Polignac number, because 78368559 - 2⁷ = 78368431 is a prime.

It is a super-2 number, since 2×78368559² = 12283262079472962, which contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78368509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 687387 + ... + 687500.

It is an arithmetic number, because the mean of its divisors is an integer number (13748880).

Almost surely, 2^78368559 is an apocalyptic number.

78368559 is a deficient number, since it is larger than the sum of its proper divisors (31622481).

78368559 is a wasteful number, since it uses less digits than its factorization.

78368559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1374909.

The product of its digits is 1814400, while the sum is 51.

The square root of 78368559 is about 8852.6018209338. The cubic root of 78368559 is about 427.9377711810.

The spelling of 78368559 in words is "seventy-eight million, three hundred sixty-eight thousand, five hundred fifty-nine".