686785344 has 56 divisors (see below), whose sum is σ = 2076712128. Its totient is φ = 196224000.

The previous prime is 686785339. The next prime is 686785361. The reversal of 686785344 is 443587686.

It is a tau number, because it is divible by the number of its divisors (56).

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 7 ways as a sum of consecutive naturals, for example, 254157 + ... + 256844.

Almost surely, 2^686785344 is an apocalyptic number.

686785344 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

686785344 is an abundant number, since it is smaller than the sum of its proper divisors (1389926784).

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

686785344 is a wasteful number, since it uses less digits than its factorization.

686785344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511023 (or 511013 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 51.

The square root of 686785344 is about 26206.5897056446. The cubic root of 686785344 is about 882.2811614874.

The spelling of 686785344 in words is "six hundred eighty-six million, seven hundred eighty-five thousand, three hundred forty-four".