686442450 has 96 divisors (see below), whose sum is σ = 1809527040. Its totient is φ = 171720000.

The previous prime is 686442443. The next prime is 686442457. The reversal of 686442450 is 54244686.

686442450 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (686442443) and next prime (686442457).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 686442399 and 686442408.

It is not an unprimeable number, because it can be changed into a prime (686442457) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 303825 + ... + 306075.

It is an arithmetic number, because the mean of its divisors is an integer number (18849240).

Almost surely, 2^686442450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686442450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (904763520).

686442450 is an abundant number, since it is smaller than the sum of its proper divisors (1123084590).

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

686442450 is a wasteful number, since it uses less digits than its factorization.

686442450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2392 (or 2387 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 39.

The square root of 686442450 is about 26200.0467556835. The cubic root of 686442450 is about 882.1343037239.

The spelling of 686442450 in words is "six hundred eighty-six million, four hundred forty-two thousand, four hundred fifty".