78326563 has 4 divisors (see below), whose sum is σ = 89516080. Its totient is φ = 67137048.

The previous prime is 78326557. The next prime is 78326597. The reversal of 78326563 is 36562387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36562387 = 23 ⋅1589669.

It is a cyclic number.

It is not a de Polignac number, because 78326563 - 2²⁵ = 44772131 is a prime.

It is a super-2 number, since 2×78326563² = 12270100942785938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78326503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5594748 + ... + 5594761.

It is an arithmetic number, because the mean of its divisors is an integer number (22379020).

Almost surely, 2^78326563 is an apocalyptic number.

78326563 is a deficient number, since it is larger than the sum of its proper divisors (11189517).

78326563 is a wasteful number, since it uses less digits than its factorization.

78326563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11189516.

The product of its digits is 181440, while the sum is 40.

The square root of 78326563 is about 8850.2295450457. The cubic root of 78326563 is about 427.8613166860.

The spelling of 78326563 in words is "seventy-eight million, three hundred twenty-six thousand, five hundred sixty-three".