685966320 has 400 divisors, whose sum is σ = 2722325760. Its totient is φ = 158588928.

The previous prime is 685966313. The next prime is 685966339. The reversal of 685966320 is 23669586.

It is a happy number.

685966320 is a `hidden beast` number, since 6 + 8 + 5 + 9 + 6 + 632 + 0 = 666.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1431841 + ... + 1432319.

Almost surely, 2^685966320 is an apocalyptic number.

685966320 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 685966320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1361162880).

685966320 is an abundant number, since it is smaller than the sum of its proper divisors (2036359440).

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

685966320 is a wasteful number, since it uses less digits than its factorization.

685966320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534 (or 519 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The square root of 685966320 is about 26190.9587453381. The cubic root of 685966320 is about 881.9303013089.

The spelling of 685966320 in words is "six hundred eighty-five million, nine hundred sixty-six thousand, three hundred twenty".