687222666 has 48 divisors (see below), whose sum is σ = 1687926240. Its totient is φ = 200322720.

The previous prime is 687222661. The next prime is 687222677. The reversal of 687222666 is 666222786.

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

It is not an unprimeable number, because it can be changed into a prime (687222661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72840 + ... + 81731.

It is an arithmetic number, because the mean of its divisors is an integer number (35165130).

Almost surely, 2^687222666 is an apocalyptic number.

687222666 is an abundant number, since it is smaller than the sum of its proper divisors (1000703574).

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

687222666 is a wasteful number, since it uses less digits than its factorization.

687222666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154611 (or 154608 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 687222666 is about 26214.9321189279. The cubic root of 687222666 is about 882.4683908246.

The spelling of 687222666 in words is "six hundred eighty-seven million, two hundred twenty-two thousand, six hundred sixty-six".