686283840 has 560 divisors, whose sum is σ = 2788188480. Its totient is φ = 158699520.

The previous prime is 686283839. The next prime is 686283841. The reversal of 686283840 is 48382686.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (686283839) and next prime (686283841).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686283841) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 8268439 + ... + 8268521.

It is an arithmetic number, because the mean of its divisors is an integer number (4978908).

Almost surely, 2^686283840 is an apocalyptic number.

686283840 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 686283840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1394094240).

686283840 is an abundant number, since it is smaller than the sum of its proper divisors (2101904640).

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

686283840 is a wasteful number, since it uses less digits than its factorization.

686283840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152 (or 133 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 45.

The square root of 686283840 is about 26197.0196778183. The cubic root of 686283840 is about 882.0663562460.

The spelling of 686283840 in words is "six hundred eighty-six million, two hundred eighty-three thousand, eight hundred forty".