685759720 has 32 divisors (see below), whose sum is σ = 1610046720. Its totient is φ = 262377280.

The previous prime is 685759699. The next prime is 685759721. The reversal of 685759720 is 27957586.

It is not an unprimeable number, because it can be changed into a prime (685759721) 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, 371776 + ... + 373615.

It is an arithmetic number, because the mean of its divisors is an integer number (50313960).

Almost surely, 2^685759720 is an apocalyptic number.

It is an amenable number.

685759720 is an abundant number, since it is smaller than the sum of its proper divisors (924287000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

685759720 is a wasteful number, since it uses less digits than its factorization.

685759720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745425 (or 745421 counting only the distinct ones).

The product of its (nonzero) digits is 1058400, while the sum is 49.

The square root of 685759720 is about 26187.0143391720. The cubic root of 685759720 is about 881.8417522114.

The spelling of 685759720 in words is "six hundred eighty-five million, seven hundred fifty-nine thousand, seven hundred twenty".