685561724 has 12 divisors (see below), whose sum is σ = 1262877000. Its totient is φ = 324739728.

The previous prime is 685561687. The next prime is 685561741. The reversal of 685561724 is 427165586.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4510199 + ... + 4510350.

It is an arithmetic number, because the mean of its divisors is an integer number (105239750).

Almost surely, 2^685561724 is an apocalyptic number.

It is an amenable number.

685561724 is a deficient number, since it is larger than the sum of its proper divisors (577315276).

685561724 is a wasteful number, since it uses less digits than its factorization.

685561724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9020572 (or 9020570 counting only the distinct ones).

The product of its digits is 403200, while the sum is 44.

The square root of 685561724 is about 26183.2336429250. The cubic root of 685561724 is about 881.7568741114.

The spelling of 685561724 in words is "six hundred eighty-five million, five hundred sixty-one thousand, seven hundred twenty-four".