686454520 has 32 divisors (see below), whose sum is σ = 1546477920. Its totient is φ = 274234240.

The previous prime is 686454511. The next prime is 686454523. The reversal of 686454520 is 25454686.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686454523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22389 + ... + 43291.

It is an arithmetic number, because the mean of its divisors is an integer number (48327435).

Almost surely, 2^686454520 is an apocalyptic number.

It is an amenable number.

686454520 is an abundant number, since it is smaller than the sum of its proper divisors (860023400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686454520 is a wasteful number, since it uses less digits than its factorization.

686454520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21735 (or 21731 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 40.

The square root of 686454520 is about 26200.2770977713. The cubic root of 686454520 is about 882.1394740037.

The spelling of 686454520 in words is "six hundred eighty-six million, four hundred fifty-four thousand, five hundred twenty".