685748319 has 8 divisors (see below), whose sum is σ = 914500992. Its totient is φ = 457080600.

The previous prime is 685748309. The next prime is 685748333. The reversal of 685748319 is 913847586.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-685748319 is a prime.

It is a super-2 number, since 2×685748319² = 940501514022651522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685748309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 894 + ... + 37044.

It is an arithmetic number, because the mean of its divisors is an integer number (114312624).

Almost surely, 2^685748319 is an apocalyptic number.

685748319 is a deficient number, since it is larger than the sum of its proper divisors (228752673).

685748319 is a wasteful number, since it uses less digits than its factorization.

685748319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42477.

The product of its digits is 1451520, while the sum is 51.

The square root of 685748319 is about 26186.7966540392. The cubic root of 685748319 is about 881.8368652064.

The spelling of 685748319 in words is "six hundred eighty-five million, seven hundred forty-eight thousand, three hundred nineteen".