686502740 has 144 divisors (see below), whose sum is σ = 1873295424. Its totient is φ = 208857600.

The previous prime is 686502679. The next prime is 686502797. The reversal of 686502740 is 47205686.

It is a happy number.

686502740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 686502694 and 686502703.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 462800 + ... + 464280.

It is an arithmetic number, because the mean of its divisors is an integer number (13008996).

Almost surely, 2^686502740 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 686502740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (936647712).

686502740 is an abundant number, since it is smaller than the sum of its proper divisors (1186792684).

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

686502740 is a wasteful number, since it uses less digits than its factorization.

686502740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1558 (or 1549 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 686502740 is about 26201.1973008868. The cubic root of 686502740 is about 882.1601288169.

The spelling of 686502740 in words is "six hundred eighty-six million, five hundred two thousand, seven hundred forty".