686320293438 has 24 divisors (see below), whose sum is σ = 1601414018568. Its totient is φ = 211175474832.

The previous prime is 686320293359. The next prime is 686320293443. The reversal of 686320293438 is 834392023686.

686320293438 is a `hidden beast` number, since 68 + 63 + 2 + 0 + 2 + 93 + 438 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1466496120 + ... + 1466496587.

It is an arithmetic number, because the mean of its divisors is an integer number (66725584107).

Almost surely, 2^686320293438 is an apocalyptic number.

686320293438 is an abundant number, since it is smaller than the sum of its proper divisors (915093725130).

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

686320293438 is a wasteful number, since it uses less digits than its factorization.

686320293438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2932992728 (or 2932992725 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 54.

The spelling of 686320293438 in words is "six hundred eighty-six billion, three hundred twenty million, two hundred ninety-three thousand, four hundred thirty-eight".