685787223808 has 36 divisors (see below), whose sum is σ = 1369614393000. Its totient is φ = 342713560064.

The previous prime is 685787223767. The next prime is 685787223833. The reversal of 685787223808 is 808322787586.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a self number, because there is not a number n which added to its sum of digits gives 685787223808.

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, 214183 + ... + 1190566.

It is an arithmetic number, because the mean of its divisors is an integer number (38044844250).

Almost surely, 2^685787223808 is an apocalyptic number.

It is an amenable number.

685787223808 is a deficient number, since it is larger than the sum of its proper divisors (683827169192).

685787223808 is a wasteful number, since it uses less digits than its factorization.

685787223808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406672 (or 1406658 counting only the distinct ones).

The product of its (nonzero) digits is 72253440, while the sum is 64.

The spelling of 685787223808 in words is "six hundred eighty-five billion, seven hundred eighty-seven million, two hundred twenty-three thousand, eight hundred eight".