686503204 has 6 divisors (see below), whose sum is σ = 1201380614. Its totient is φ = 343251600.

The previous prime is 686503187. The next prime is 686503219. The reversal of 686503204 is 402305686.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 678081600 + 8421604 = 26040^2 + 2902^2 .

It is a super-4 number, since 4×686503204⁴ (a number of 36 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3.

It is a self number, because there is not a number n which added to its sum of digits gives 686503204.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85812897 + ... + 85812904.

Almost surely, 2^686503204 is an apocalyptic number.

It is an amenable number.

686503204 is a deficient number, since it is larger than the sum of its proper divisors (514877410).

686503204 is a wasteful number, since it uses less digits than its factorization.

686503204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171625805 (or 171625803 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 686503204 is about 26201.2061554425. The cubic root of 686503204 is about 882.1603275644.

The spelling of 686503204 in words is "six hundred eighty-six million, five hundred three thousand, two hundred four".