686730465 has 24 divisors (see below), whose sum is σ = 1191758568. Its totient is φ = 365817600.

The previous prime is 686730461. The next prime is 686730523. The reversal of 686730465 is 564037686.

It can be written as a sum of positive squares in 4 ways, for example, as 190688481 + 496041984 = 13809^2 + 22272^2 .

It is not a de Polignac number, because 686730465 - 2² = 686730461 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 686730465.

It is not an unprimeable number, because it can be changed into a prime (686730461) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30765 + ... + 48165.

It is an arithmetic number, because the mean of its divisors is an integer number (49656607).

Almost surely, 2^686730465 is an apocalyptic number.

It is an amenable number.

686730465 is a deficient number, since it is larger than the sum of its proper divisors (505028103).

686730465 is a wasteful number, since it uses less digits than its factorization.

686730465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18289 (or 18286 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The square root of 686730465 is about 26205.5426389151. The cubic root of 686730465 is about 882.2576606959.

The spelling of 686730465 in words is "six hundred eighty-six million, seven hundred thirty thousand, four hundred sixty-five".