685278389376 has 512 divisors, whose sum is σ = 2413062144000. Its totient is φ = 187330682880.

The previous prime is 685278389359. The next prime is 685278389399. The reversal of 685278389376 is 673983872586.

It is a happy number.

685278389376 is a `hidden beast` number, since 6 + 8 + 527 + 8 + 3 + 8 + 93 + 7 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 66740595 + ... + 66750861.

It is an arithmetic number, because the mean of its divisors is an integer number (4713012000).

Almost surely, 2^685278389376 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 685278389376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1206531072000).

685278389376 is an abundant number, since it is smaller than the sum of its proper divisors (1727783754624).

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

685278389376 is a wasteful number, since it uses less digits than its factorization.

685278389376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10417 (or 10399 counting only the distinct ones).

The product of its digits is 731566080, while the sum is 72.

The spelling of 685278389376 in words is "six hundred eighty-five billion, two hundred seventy-eight million, three hundred eighty-nine thousand, three hundred seventy-six".