687222308 has 6 divisors (see below), whose sum is σ = 1202639046. Its totient is φ = 343611152.

The previous prime is 687222307. The next prime is 687222323. The reversal of 687222308 is 803222786.

It can be written as a sum of positive squares in only one way, i.e., 551686144 + 135536164 = 23488^2 + 11642^2 .

It is a super-2 number, since 2×687222308² = 944549001225693728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (687222307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85902785 + ... + 85902792.

It is an arithmetic number, because the mean of its divisors is an integer number (200439841).

Almost surely, 2^687222308 is an apocalyptic number.

It is an amenable number.

687222308 is a deficient number, since it is larger than the sum of its proper divisors (515416738).

687222308 is a wasteful number, since it uses less digits than its factorization.

687222308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171805581 (or 171805579 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 687222308 is about 26214.9252907576. The cubic root of 687222308 is about 882.4682375876.

The spelling of 687222308 in words is "six hundred eighty-seven million, two hundred twenty-two thousand, three hundred eight".