78428818 has 64 divisors (see below), whose sum is σ = 139708800. Its totient is φ = 32739840.

The previous prime is 78428809. The next prime is 78428869. The reversal of 78428818 is 81882487.

It is a happy 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 31 ways as a sum of consecutive naturals, for example, 1329273 + ... + 1329331.

It is an arithmetic number, because the mean of its divisors is an integer number (2182950).

Almost surely, 2^78428818 is an apocalyptic number.

78428818 is a deficient number, since it is larger than the sum of its proper divisors (61279982).

78428818 is a wasteful number, since it uses less digits than its factorization.

78428818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187.

The product of its digits is 229376, while the sum is 46.

The square root of 78428818 is about 8856.0046296284. The cubic root of 78428818 is about 428.0474261069.

The spelling of 78428818 in words is "seventy-eight million, four hundred twenty-eight thousand, eight hundred eighteen".