686446992 has 120 divisors (see below), whose sum is σ = 2395174080. Its totient is φ = 178295040.

The previous prime is 686446967. The next prime is 686446993. The reversal of 686446992 is 299644686.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (686446993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19867 + ... + 42042.

It is an arithmetic number, because the mean of its divisors is an integer number (19959784).

Almost surely, 2^686446992 is an apocalyptic number.

It is an amenable number.

686446992 is an abundant number, since it is smaller than the sum of its proper divisors (1708727088).

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

686446992 is a wasteful number, since it uses less digits than its factorization.

686446992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61941 (or 61932 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 54.

The square root of 686446992 is about 26200.1334347747. The cubic root of 686446992 is about 882.1362493326.

The spelling of 686446992 in words is "six hundred eighty-six million, four hundred forty-six thousand, nine hundred ninety-two".