687798618 has 16 divisors (see below), whose sum is σ = 1481412576. Its totient is φ = 211630320.

The previous prime is 687798589. The next prime is 687798619. The reversal of 687798618 is 816897786.

It is not an unprimeable number, because it can be changed into a prime (687798619) 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 in 7 ways as a sum of consecutive naturals, for example, 4408888 + ... + 4409043.

It is an arithmetic number, because the mean of its divisors is an integer number (92588286).

Almost surely, 2^687798618 is an apocalyptic number.

687798618 is an abundant number, since it is smaller than the sum of its proper divisors (793613958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

687798618 is a wasteful number, since it uses less digits than its factorization.

687798618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8817949.

The product of its digits is 8128512, while the sum is 60.

The square root of 687798618 is about 26225.9150078696. The cubic root of 687798618 is about 882.7148502510.

The spelling of 687798618 in words is "six hundred eighty-seven million, seven hundred ninety-eight thousand, six hundred eighteen".