78684228 has 72 divisors (see below), whose sum is σ = 240694272. Its totient is φ = 21157632.

The previous prime is 78684181. The next prime is 78684253. The reversal of 78684228 is 82248687.

It is a happy number.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4900 + ... + 13467.

It is an arithmetic number, because the mean of its divisors is an integer number (3342976).

Almost surely, 2^78684228 is an apocalyptic number.

It is an amenable number.

78684228 is an abundant number, since it is smaller than the sum of its proper divisors (162010044).

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

78684228 is a wasteful number, since it uses less digits than its factorization.

78684228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18401 (or 18396 counting only the distinct ones).

The product of its digits is 344064, while the sum is 45.

The square root of 78684228 is about 8870.4130681722. The cubic root of 78684228 is about 428.5115800237.

The spelling of 78684228 in words is "seventy-eight million, six hundred eighty-four thousand, two hundred twenty-eight".