78855728 has 20 divisors (see below), whose sum is σ = 174609360. Its totient is φ = 33795264.

The previous prime is 78855703. The next prime is 78855731. The reversal of 78855728 is 82755887.

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, 351923 + ... + 352146.

It is an arithmetic number, because the mean of its divisors is an integer number (8730468).

Almost surely, 2^78855728 is an apocalyptic number.

It is an amenable number.

78855728 is an abundant number, since it is smaller than the sum of its proper divisors (95753632).

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

78855728 is a wasteful number, since it uses less digits than its factorization.

78855728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704084 (or 704078 counting only the distinct ones).

The product of its digits is 1254400, while the sum is 50.

The square root of 78855728 is about 8880.0747744600. The cubic root of 78855728 is about 428.8226817938.

The spelling of 78855728 in words is "seventy-eight million, eight hundred fifty-five thousand, seven hundred twenty-eight".