685517764 has 6 divisors (see below), whose sum is σ = 1199656094. Its totient is φ = 342758880.

The previous prime is 685517761. The next prime is 685517779. The reversal of 685517764 is 467715586.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 354568900 + 330948864 = 18830^2 + 18192^2 .

It is not an unprimeable number, because it can be changed into a prime (685517761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85689717 + ... + 85689724.

Almost surely, 2^685517764 is an apocalyptic number.

It is an amenable number.

685517764 is a deficient number, since it is larger than the sum of its proper divisors (514138330).

685517764 is a wasteful number, since it uses less digits than its factorization.

685517764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171379445 (or 171379443 counting only the distinct ones).

The product of its digits is 1411200, while the sum is 49.

The square root of 685517764 is about 26182.3941609624. The cubic root of 685517764 is about 881.7380268609.

The spelling of 685517764 in words is "six hundred eighty-five million, five hundred seventeen thousand, seven hundred sixty-four".