687601066 has 4 divisors (see below), whose sum is σ = 1031401602. Its totient is φ = 343800532.

The previous prime is 687601039. The next prime is 687601067. The reversal of 687601066 is 660106786.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 504945841 + 182655225 = 22471^2 + 13515^2 .

It is not an unprimeable number, because it can be changed into a prime (687601067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171900265 + ... + 171900268.

Almost surely, 2^687601066 is an apocalyptic number.

687601066 is a deficient number, since it is larger than the sum of its proper divisors (343800536).

687601066 is a wasteful number, since it uses less digits than its factorization.

687601066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343800535.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 687601066 is about 26222.1483864309. The cubic root of 687601066 is about 882.6303299773.

The spelling of 687601066 in words is "six hundred eighty-seven million, six hundred one thousand, sixty-six".