686948935540 has 48 divisors (see below), whose sum is σ = 1648745062272. Its totient is φ = 235515689856.

The previous prime is 686948935537. The next prime is 686948935577. The reversal of 686948935540 is 45539849686.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3887754 + ... + 4060606.

It is an arithmetic number, because the mean of its divisors is an integer number (34348855464).

Almost surely, 2^686948935540 is an apocalyptic number.

It is an amenable number.

686948935540 is an abundant number, since it is smaller than the sum of its proper divisors (961796126732).

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

686948935540 is a wasteful number, since it uses less digits than its factorization.

686948935540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201256 (or 201254 counting only the distinct ones).

The product of its (nonzero) digits is 223948800, while the sum is 67.

The spelling of 686948935540 in words is "six hundred eighty-six billion, nine hundred forty-eight million, nine hundred thirty-five thousand, five hundred forty".