687228361 has 4 divisors (see below), whose sum is σ = 687281092. Its totient is φ = 687175632.

The previous prime is 687228329. The next prime is 687228389. The reversal of 687228361 is 163822786.

687228361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 19316025 + 667912336 = 4395^2 + 25844^2 .

It is a cyclic number.

It is not a de Polignac number, because 687228361 - 2⁵ = 687228329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687228161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8971 + ... + 38143.

It is an arithmetic number, because the mean of its divisors is an integer number (171820273).

Almost surely, 2^687228361 is an apocalyptic number.

It is an amenable number.

687228361 is a deficient number, since it is larger than the sum of its proper divisors (52731).

687228361 is a wasteful number, since it uses less digits than its factorization.

687228361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52730.

The product of its digits is 193536, while the sum is 43.

The square root of 687228361 is about 26215.0407400027. The cubic root of 687228361 is about 882.4708284836.

The spelling of 687228361 in words is "six hundred eighty-seven million, two hundred twenty-eight thousand, three hundred sixty-one".