78928218 has 12 divisors (see below), whose sum is σ = 171011178. Its totient is φ = 26309400.

The previous prime is 78928217. The next prime is 78928237. The reversal of 78928218 is 81282987.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 73153809 + 5774409 = 8553^2 + 2403^2 .

It is not an unprimeable number, because it can be changed into a prime (78928217) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 2192433 + ... + 2192468.

Almost surely, 2^78928218 is an apocalyptic number.

78928218 is an abundant number, since it is smaller than the sum of its proper divisors (92082960).

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

78928218 is a wasteful number, since it uses less digits than its factorization.

78928218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4384909 (or 4384906 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The square root of 78928218 is about 8884.1554466364. The cubic root of 78928218 is about 428.9540433598.

It can be divided in two parts, 7892 and 8218, that added together give a triangular number (16110 = T₁₇₉).

The spelling of 78928218 in words is "seventy-eight million, nine hundred twenty-eight thousand, two hundred eighteen".