686435605 has 16 divisors (see below), whose sum is σ = 874997424. Its totient is φ = 515174400.

The previous prime is 686435579. The next prime is 686435627. The reversal of 686435605 is 506534686.

It can be written as a sum of positive squares in 8 ways, for example, as 47458321 + 638977284 = 6889^2 + 25278^2 .

It is not a de Polignac number, because 686435605 - 2¹⁷ = 686304533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13705 + ... + 39505.

It is an arithmetic number, because the mean of its divisors is an integer number (54687339).

Almost surely, 2^686435605 is an apocalyptic number.

It is an amenable number.

686435605 is a deficient number, since it is larger than the sum of its proper divisors (188561819).

686435605 is a wasteful number, since it uses less digits than its factorization.

686435605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26136.

The product of its (nonzero) digits is 518400, while the sum is 43.

The square root of 686435605 is about 26199.9161258199. The cubic root of 686435605 is about 882.1313715872.

The spelling of 686435605 in words is "six hundred eighty-six million, four hundred thirty-five thousand, six hundred five".