685729735744 has 21 divisors (see below), whose sum is σ = 1360758090391. Its totient is φ = 342861555520.

The previous prime is 685729735651. The next prime is 685729735759. The reversal of 685729735744 is 447537927586.

The square root of 685729735744 is 828088.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 685729735744.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 6572949 + ... + 6676459.

Almost surely, 2^685729735744 is an apocalyptic number.

685729735744 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

685729735744 is the 828088-th square number.

It is an amenable number.

685729735744 is a deficient number, since it is larger than the sum of its proper divisors (675028354647).

685729735744 is an frugal number, since it uses more digits than its factorization.

685729735744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207034 (or 103513 counting only the distinct ones).

The product of its digits is 355622400, while the sum is 67.

The spelling of 685729735744 in words is "six hundred eighty-five billion, seven hundred twenty-nine million, seven hundred thirty-five thousand, seven hundred forty-four".