686287420 has 192 divisors, whose sum is σ = 1853300736. Its totient is φ = 207728640.

The previous prime is 686287379. The next prime is 686287423. The reversal of 686287420 is 24782686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686287423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6073284 + ... + 6073396.

It is an arithmetic number, because the mean of its divisors is an integer number (9652608).

Almost surely, 2^686287420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686287420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (926650368).

686287420 is an abundant number, since it is smaller than the sum of its proper divisors (1167013316).

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

686287420 is a wasteful number, since it uses less digits than its factorization.

686287420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260 (or 258 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 43.

The square root of 686287420 is about 26197.0880061124. The cubic root of 686287420 is about 882.0678900099.

The spelling of 686287420 in words is "six hundred eighty-six million, two hundred eighty-seven thousand, four hundred twenty".