685504287 has 48 divisors (see below), whose sum is σ = 1126725600. Its totient is φ = 398131200.

The previous prime is 685504247. The next prime is 685504289. The reversal of 685504287 is 782405586.

685504287 is a `hidden beast` number, since 68 + 5 + 504 + 2 + 87 = 666.

It is not a de Polignac number, because 685504287 - 2⁶ = 685504223 is a prime.

It is a super-3 number, since 3×685504287³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685504289) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 891039 + ... + 891807.

It is an arithmetic number, because the mean of its divisors is an integer number (23473450).

Almost surely, 2^685504287 is an apocalyptic number.

685504287 is a deficient number, since it is larger than the sum of its proper divisors (441221313).

685504287 is a wasteful number, since it uses less digits than its factorization.

685504287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1208 (or 1205 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 45.

The square root of 685504287 is about 26182.1367920955. The cubic root of 685504287 is about 881.7322486195.

The spelling of 685504287 in words is "six hundred eighty-five million, five hundred four thousand, two hundred eighty-seven".