686782944 has 72 divisors (see below), whose sum is σ = 2037973392. Its totient is φ = 218972160.

The previous prime is 686782933. The next prime is 686782969. The reversal of 686782944 is 449287686.

It is a tau number, because it is divible by the number of its divisors (72).

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 11 ways as a sum of consecutive naturals, for example, 45217 + ... + 58464.

It is an arithmetic number, because the mean of its divisors is an integer number (28305186).

Almost surely, 2^686782944 is an apocalyptic number.

It is an amenable number.

686782944 is an abundant number, since it is smaller than the sum of its proper divisors (1351190448).

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

686782944 is a wasteful number, since it uses less digits than its factorization.

686782944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103720 (or 103709 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 54.

The square root of 686782944 is about 26206.5439155948. The cubic root of 686782944 is about 882.2801337634.

The spelling of 686782944 in words is "six hundred eighty-six million, seven hundred eighty-two thousand, nine hundred forty-four".