78520163 has 4 divisors (see below), whose sum is σ = 79138560. Its totient is φ = 77901768.

The previous prime is 78520159. The next prime is 78520171. The reversal of 78520163 is 36102587.

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 78520163 - 2² = 78520159 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (78520133) 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, 309008 + ... + 309261.

It is an arithmetic number, because the mean of its divisors is an integer number (19784640).

Almost surely, 2^78520163 is an apocalyptic number.

78520163 is a deficient number, since it is larger than the sum of its proper divisors (618397).

78520163 is a wasteful number, since it uses less digits than its factorization.

78520163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618396.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 78520163 is about 8861.1603641961. The cubic root of 78520163 is about 428.2135420117.

The spelling of 78520163 in words is "seventy-eight million, five hundred twenty thousand, one hundred sixty-three".