78809568 has 48 divisors (see below), whose sum is σ = 217768320. Its totient is φ = 24886656.

The previous prime is 78809483. The next prime is 78809573. The reversal of 78809568 is 86590887.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 78809568.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 19780 + ... + 23427.

It is an arithmetic number, because the mean of its divisors is an integer number (4536840).

Almost surely, 2^78809568 is an apocalyptic number.

It is an amenable number.

78809568 is an abundant number, since it is smaller than the sum of its proper divisors (138958752).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78809568 is a wasteful number, since it uses less digits than its factorization.

78809568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43239 (or 43231 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 51.

The square root of 78809568 is about 8877.4753167779. The cubic root of 78809568 is about 428.7389917473.

The spelling of 78809568 in words is "seventy-eight million, eight hundred nine thousand, five hundred sixty-eight".