78804564 has 12 divisors (see below), whose sum is σ = 183877344. Its totient is φ = 26268184.

The previous prime is 78804559. The next prime is 78804611. The reversal of 78804564 is 46540887.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

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, 3283512 + ... + 3283535.

It is an arithmetic number, because the mean of its divisors is an integer number (15323112).

Almost surely, 2^78804564 is an apocalyptic number.

It is an amenable number.

78804564 is an abundant number, since it is smaller than the sum of its proper divisors (105072780).

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

78804564 is a wasteful number, since it uses less digits than its factorization.

78804564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6567054 (or 6567052 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 42.

The square root of 78804564 is about 8877.1934754178. The cubic root of 78804564 is about 428.7299173190.

The spelling of 78804564 in words is "seventy-eight million, eight hundred four thousand, five hundred sixty-four".