685720347 has 32 divisors (see below), whose sum is σ = 1054347840. Its totient is φ = 392663040.

The previous prime is 685720331. The next prime is 685720349. The reversal of 685720347 is 743027586.

It is not a de Polignac number, because 685720347 - 2⁴ = 685720331 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 685720299 and 685720308.

It is not an unprimeable number, because it can be changed into a prime (685720349) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53197 + ... + 64817.

It is an arithmetic number, because the mean of its divisors is an integer number (32948370).

Almost surely, 2^685720347 is an apocalyptic number.

685720347 is a deficient number, since it is larger than the sum of its proper divisors (368627493).

685720347 is a wasteful number, since it uses less digits than its factorization.

685720347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11743.

The product of its (nonzero) digits is 282240, while the sum is 42.

The square root of 685720347 is about 26186.2625626491. The cubic root of 685720347 is about 881.8248748617.

The spelling of 685720347 in words is "six hundred eighty-five million, seven hundred twenty thousand, three hundred forty-seven".