78578864 has 80 divisors (see below), whose sum is σ = 193945920. Its totient is φ = 29998080.

The previous prime is 78578809. The next prime is 78578867. The reversal of 78578864 is 46887587.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (78578867) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 41294 + ... + 43154.

It is an arithmetic number, because the mean of its divisors is an integer number (2424324).

Almost surely, 2^78578864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78578864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96972960).

78578864 is an abundant number, since it is smaller than the sum of its proper divisors (115367056).

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

78578864 is a wasteful number, since it uses less digits than its factorization.

78578864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1918 (or 1912 counting only the distinct ones).

The product of its digits is 3010560, while the sum is 53.

The square root of 78578864 is about 8864.4720090934. The cubic root of 78578864 is about 428.3202250207.

The spelling of 78578864 in words is "seventy-eight million, five hundred seventy-eight thousand, eight hundred sixty-four".