687331090 has 8 divisors (see below), whose sum is σ = 1237195980. Its totient is φ = 274932432.

The previous prime is 687331087. The next prime is 687331109. The reversal of 687331090 is 90133786.

It is a Cunningham number, because it is equal to 26217²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 687331089 + 1 = 26217^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34366545 + ... + 34366564.

Almost surely, 2^687331090 is an apocalyptic number.

687331090 is a deficient number, since it is larger than the sum of its proper divisors (549864890).

687331090 is a wasteful number, since it uses less digits than its factorization.

687331090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68733116.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 687331090 is about 26217.0000190716. Note that the first 4 decimals coincide. The cubic root of 687331090 is about 882.5147977734.

The spelling of 687331090 in words is "six hundred eighty-seven million, three hundred thirty-one thousand, ninety".