687228228 has 18 divisors (see below), whose sum is σ = 1737160334. Its totient is φ = 229076064.

The previous prime is 687228209. The next prime is 687228229. The reversal of 687228228 is 822822786.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 681836544 + 5391684 = 26112^2 + 2322^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (687228229) 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, 9544801 + ... + 9544872.

Almost surely, 2^687228228 is an apocalyptic number.

It is an amenable number.

687228228 is an abundant number, since it is smaller than the sum of its proper divisors (1049932106).

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

687228228 is a wasteful number, since it uses less digits than its factorization.

687228228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19089683 (or 19089678 counting only the distinct ones).

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

The square root of 687228228 is about 26215.0382032909. The cubic root of 687228228 is about 882.4707715551.

The spelling of 687228228 in words is "six hundred eighty-seven million, two hundred twenty-eight thousand, two hundred twenty-eight".