686213952 has 56 divisors (see below), whose sum is σ = 1857853536. Its totient is φ = 223415808.

The previous prime is 686213929. The next prime is 686213953. The reversal of 686213952 is 259312686.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686213953) 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 7 ways as a sum of consecutive naturals, for example, 33303 + ... + 49814.

It is an arithmetic number, because the mean of its divisors is an integer number (33175956).

Almost surely, 2^686213952 is an apocalyptic number.

It is an amenable number.

686213952 is an abundant number, since it is smaller than the sum of its proper divisors (1171639584).

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

686213952 is a wasteful number, since it uses less digits than its factorization.

686213952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83175 (or 83165 counting only the distinct ones).

The product of its digits is 155520, while the sum is 42.

The square root of 686213952 is about 26195.6857516653. The cubic root of 686213952 is about 882.0364133649.

The spelling of 686213952 in words is "six hundred eighty-six million, two hundred thirteen thousand, nine hundred fifty-two".