686779494 has 16 divisors (see below), whose sum is σ = 1433279232. Its totient is φ = 218973128.

The previous prime is 686779477. The next prime is 686779507. The reversal of 686779494 is 494977686.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 2488194 + ... + 2488469.

It is an arithmetic number, because the mean of its divisors is an integer number (89579952).

Almost surely, 2^686779494 is an apocalyptic number.

686779494 is an abundant number, since it is smaller than the sum of its proper divisors (746499738).

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

686779494 is a wasteful number, since it uses less digits than its factorization.

686779494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4976691.

The product of its digits is 18289152, while the sum is 60.

The square root of 686779494 is about 26206.4780922580. The cubic root of 686779494 is about 882.2786564061.

The spelling of 686779494 in words is "six hundred eighty-six million, seven hundred seventy-nine thousand, four hundred ninety-four".