687961798 has 8 divisors (see below), whose sum is σ = 1037708280. Its totient is φ = 342059040.

The previous prime is 687961777. The next prime is 687961801. The reversal of 687961798 is 897169786.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 960483 + ... + 961198.

It is an arithmetic number, because the mean of its divisors is an integer number (129713535).

Almost surely, 2^687961798 is an apocalyptic number.

687961798 is a deficient number, since it is larger than the sum of its proper divisors (349746482).

687961798 is a wasteful number, since it uses less digits than its factorization.

687961798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1921862.

The product of its digits is 9144576, while the sum is 61.

The square root of 687961798 is about 26229.0258683009. The cubic root of 687961798 is about 882.7846526688.

The spelling of 687961798 in words is "six hundred eighty-seven million, nine hundred sixty-one thousand, seven hundred ninety-eight".