686799744 has 64 divisors (see below), whose sum is σ = 1838807040. Its totient is φ = 227114496.

The previous prime is 686799731. The next prime is 686799787. The reversal of 686799744 is 447997686.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41727 + ... + 55809.

It is an arithmetic number, because the mean of its divisors is an integer number (28731360).

Almost surely, 2^686799744 is an apocalyptic number.

686799744 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686799744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (919403520).

686799744 is an abundant number, since it is smaller than the sum of its proper divisors (1152007296).

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

686799744 is a wasteful number, since it uses less digits than its factorization.

686799744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14227 (or 14215 counting only the distinct ones).

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

The square root of 686799744 is about 26206.8644442635. The cubic root of 686799744 is about 882.2873277809.

The spelling of 686799744 in words is "six hundred eighty-six million, seven hundred ninety-nine thousand, seven hundred forty-four".