686496240 has 120 divisors (see below), whose sum is σ = 2379931008. Its totient is φ = 177154560.

The previous prime is 686496233. The next prime is 686496253. The reversal of 686496240 is 42694686.

686496240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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 polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6942 + ... + 37698.

Almost surely, 2^686496240 is an apocalyptic number.

686496240 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 686496240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1189965504).

686496240 is an abundant number, since it is smaller than the sum of its proper divisors (1693434768).

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

686496240 is a wasteful number, since it uses less digits than its factorization.

686496240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30807 (or 30798 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The square root of 686496240 is about 26201.0732604602. The cubic root of 686496240 is about 882.1573446284.

The spelling of 686496240 in words is "six hundred eighty-six million, four hundred ninety-six thousand, two hundred forty".