686289645 has 32 divisors (see below), whose sum is σ = 1222732800. Its totient is φ = 365222592.

The previous prime is 686289641. The next prime is 686289661. The reversal of 686289645 is 546982686.

It is a happy number.

686289645 is a `hidden beast` number, since 6 + 8 + 628 + 9 + 6 + 4 + 5 = 666.

It is not a de Polignac number, because 686289645 - 2² = 686289641 is a prime.

It is a super-3 number, since 3×686289645³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 686289591 and 686289600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686289641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59359 + ... + 69971.

It is an arithmetic number, because the mean of its divisors is an integer number (38210400).

Almost surely, 2^686289645 is an apocalyptic number.

It is an amenable number.

686289645 is a deficient number, since it is larger than the sum of its proper divisors (536443155).

686289645 is a wasteful number, since it uses less digits than its factorization.

686289645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11106 (or 11100 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The square root of 686289645 is about 26197.1304726300. The cubic root of 686289645 is about 882.0688432543.

The spelling of 686289645 in words is "six hundred eighty-six million, two hundred eighty-nine thousand, six hundred forty-five".