78168359 has 4 divisors (see below), whose sum is σ = 78218904. Its totient is φ = 78117816.

The previous prime is 78168341. The next prime is 78168401. The reversal of 78168359 is 95386187.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 78168359 - 2¹² = 78164263 is a prime.

It is a super-2 number, since 2×78168359² = 12220584697505762, which 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 (78168319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22877 + ... + 26070.

It is an arithmetic number, because the mean of its divisors is an integer number (19554726).

Almost surely, 2^78168359 is an apocalyptic number.

78168359 is a deficient number, since it is larger than the sum of its proper divisors (50545).

78168359 is a wasteful number, since it uses less digits than its factorization.

78168359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50544.

The product of its digits is 362880, while the sum is 47.

The square root of 78168359 is about 8841.2871800434. The cubic root of 78168359 is about 427.5730577465.

The spelling of 78168359 in words is "seventy-eight million, one hundred sixty-eight thousand, three hundred fifty-nine".