686407158 has 48 divisors (see below), whose sum is σ = 1526917392. Its totient is φ = 222720000.

The previous prime is 686407153. The next prime is 686407201. The reversal of 686407158 is 851704686.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686407153) 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 23 ways as a sum of consecutive naturals, for example, 472333 + ... + 473783.

It is an arithmetic number, because the mean of its divisors is an integer number (31810779).

Almost surely, 2^686407158 is an apocalyptic number.

686407158 is an abundant number, since it is smaller than the sum of its proper divisors (840510234).

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

686407158 is a wasteful number, since it uses less digits than its factorization.

686407158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2141 (or 2138 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 686407158 is about 26199.3732367780. The cubic root of 686407158 is about 882.1191857693.

The spelling of 686407158 in words is "six hundred eighty-six million, four hundred seven thousand, one hundred fifty-eight".