686867280 has 160 divisors (see below), whose sum is σ = 2367169920. Its totient is φ = 163338240.

The previous prime is 686867267. The next prime is 686867281. The reversal of 686867280 is 82768686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686867281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 137466 + ... + 142374.

It is an arithmetic number, because the mean of its divisors is an integer number (14794812).

Almost surely, 2^686867280 is an apocalyptic number.

686867280 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 686867280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1183584960).

686867280 is an abundant number, since it is smaller than the sum of its proper divisors (1680302640).

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

686867280 is a wasteful number, since it uses less digits than its factorization.

686867280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4989 (or 4983 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 51.

The square root of 686867280 is about 26208.1529299567. The cubic root of 686867280 is about 882.3162465472.

The spelling of 686867280 in words is "six hundred eighty-six million, eight hundred sixty-seven thousand, two hundred eighty".