686900565 has 48 divisors (see below), whose sum is σ = 1303302000. Its totient is φ = 332605440.

The previous prime is 686900561. The next prime is 686900567. The reversal of 686900565 is 565009686.

686900565 is a `hidden beast` number, since 6 + 86 + 9 + 0 + 0 + 565 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 108305649 + 578594916 = 10407^2 + 24054^2 .

It is not a de Polignac number, because 686900565 - 2² = 686900561 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 686900565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686900561) 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, 26061 + ... + 45309.

It is an arithmetic number, because the mean of its divisors is an integer number (27152125).

Almost surely, 2^686900565 is an apocalyptic number.

686900565 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

686900565 is a deficient number, since it is larger than the sum of its proper divisors (616401435).

686900565 is a wasteful number, since it uses less digits than its factorization.

686900565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19334 (or 19331 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The square root of 686900565 is about 26208.7879345841. The cubic root of 686900565 is about 882.3304984135.

The spelling of 686900565 in words is "six hundred eighty-six million, nine hundred thousand, five hundred sixty-five".