686185420 has 24 divisors (see below), whose sum is σ = 1445018400. Its totient is φ = 273706752.

The previous prime is 686185369. The next prime is 686185439. The reversal of 686185420 is 24581686.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40605 + ... + 54964.

It is an arithmetic number, because the mean of its divisors is an integer number (60209100).

Almost surely, 2^686185420 is an apocalyptic number.

It is an amenable number.

686185420 is an abundant number, since it is smaller than the sum of its proper divisors (758832980).

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

686185420 is a wasteful number, since it uses less digits than its factorization.

686185420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95937 (or 95935 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 686185420 is about 26195.1411525115. The cubic root of 686185420 is about 882.0241885034.

The spelling of 686185420 in words is "six hundred eighty-six million, one hundred eighty-five thousand, four hundred twenty".