686426580 has 144 divisors (see below), whose sum is σ = 2413442304. Its totient is φ = 154667520.

The previous prime is 686426569. The next prime is 686426593. The reversal of 686426580 is 85624686.

686426580 is a `hidden beast` number, since 6 + 8 + 64 + 2 + 6 + 580 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 85624 + ... + 93296.

It is an arithmetic number, because the mean of its divisors is an integer number (16760016).

Almost surely, 2^686426580 is an apocalyptic number.

686426580 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686426580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1206721152).

686426580 is an abundant number, since it is smaller than the sum of its proper divisors (1727015724).

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

686426580 is a wasteful number, since it uses less digits than its factorization.

686426580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7766 (or 7761 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The square root of 686426580 is about 26199.7438918780. The cubic root of 686426580 is about 882.1275055919.

The spelling of 686426580 in words is "six hundred eighty-six million, four hundred twenty-six thousand, five hundred eighty".