687500018 has 4 divisors (see below), whose sum is σ = 1031250030. Its totient is φ = 343750008.

The previous prime is 687500003. The next prime is 687500053. The reversal of 687500018 is 810005786.

It is a happy number.

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., 379743169 + 307756849 = 19487^2 + 17543^2 .

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 as a sum of consecutive naturals, namely, 171875003 + ... + 171875006.

Almost surely, 2^687500018 is an apocalyptic number.

687500018 is a deficient number, since it is larger than the sum of its proper divisors (343750012).

687500018 is a wasteful number, since it uses less digits than its factorization.

687500018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343750011.

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 687500018 is about 26220.2215475003. The cubic root of 687500018 is about 882.5870915341.

The spelling of 687500018 in words is "six hundred eighty-seven million, five hundred thousand, eighteen".