78563913 has 32 divisors (see below), whose sum is σ = 112409472. Its totient is φ = 48729600.

The previous prime is 78563911. The next prime is 78563921. The reversal of 78563913 is 31936587.

It is not a de Polignac number, because 78563913 - 2¹ = 78563911 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78563911) 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 31 ways as a sum of consecutive naturals, for example, 277470 + ... + 277752.

It is an arithmetic number, because the mean of its divisors is an integer number (3512796).

Almost surely, 2^78563913 is an apocalyptic number.

It is an amenable number.

78563913 is a deficient number, since it is larger than the sum of its proper divisors (33845559).

78563913 is a wasteful number, since it uses less digits than its factorization.

78563913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425.

The product of its digits is 136080, while the sum is 42.

The square root of 78563913 is about 8863.6286587379. The cubic root of 78563913 is about 428.2930581655.

The spelling of 78563913 in words is "seventy-eight million, five hundred sixty-three thousand, nine hundred thirteen".